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picoCTF
01 January 1337

Babygame01

Get the flag and reach the exit. Welcome to BabyGame! Navigate around the map and see what you can find!...

picoCTF, pwn, pwn/out-of-bounds
picoCTF
01 January 1337

Buffer Overflow 2

Control the return address and arguments This time you'll need to control the arguments to the function you return to!...

picoCTF, pwn, pwn/buffer-overflow, pwn/ret2win, pwn/args-on-stack, pwn/gets
picoCTF
01 January 1337

Buffer Overflow 3

Do you think you can bypass the protection and get the flag? It looks like Dr. Oswal added a stack...

picoCTF, pwn, pwn/buffer-overflow, pwn/stack-canary, pwn/ret2win, pwn/byte-by-byte
picoCTF
01 January 1337

Flag Leak

Story telling class 1/2 I'm just copying and pasting with this [program](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/flag-leak-vuln). What can go wrong? You can view [source](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/flag-leak-vuln.c)...

picoCTF, pwn, pwn/format-string
picoCTF
01 January 1337

Rps

Here's a program that plays rock, paper, scissors against you. I hear something good happens if you win 5 times...

picoCTF, pwn, pwn/strstr
picoCTF
01 January 1337

X Sixty What

Overflow x64 code Most problems before this are 32-bit x86. Now we'll consider 64-bit x86 which is a little different!...

picoCTF, pwn, pwn/buffer-overflow
picoCTF
01 January 1337

Aes Abc

AES-ECB is bad, so I rolled my own cipher block chaining mechanism - Addition Block Chaining! You can find the...

picoCTF, crypto, crypto/aes
picoCTF
01 January 1337

B00tl3grsa2

In RSA d is a lot bigger than e, why don't we use d to encrypt instead of e? Connect...

picoCTF, crypto, crypto/rsa
picoCTF
01 January 1337

B00tl3grsa3

Why use p and q when I can use more? Connect with `nc jupiter.challenges.picoctf.org 51575`. --- Connect to the service....

picoCTF, crypto, crypto/rsa, crypto/multi-prime
picoCTF
01 January 1337

College Rowing Team

I just joined my college's rowing team! To make a good first impression, I started sending my teammates positive automated...

picoCTF, crypto, crypto/rsa, crypto/unpadded
picoCTF
01 January 1337

Compress And Attack

Your goal is to find the flag. [compress_and_attack.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/compress_and_attack.py) `nc mercury.picoctf.net [port #]` --- Weโ€™re given a file, `compress_and_attack.py` and a...

picoCTF, crypto, crypto/zlib, crypto/Salsa20, crypto/brute-force
picoCTF
01 January 1337

John Pollard

Sometimes RSA [certificates](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/john-pollard-cert) are breakable --- We're given an RSA certificate. After a bit of research, I figured out the...

picoCTF, crypto, crypto/rsa, crypto/certificate
picoCTF
01 January 1337

Mini Rsa (both)

Let's decrypt this: [ciphertext](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/mini-rsa-ciphertext)? Something seems a bit small. --- *Note that the methods for this challenge work for both...

picoCTF, crypto, crypto/rsa, crypto/brute-force, crypto/small-e
picoCTF
01 January 1337

New Vignere

Another slight twist on a classic, see if you can recover the flag. (Wrap with picoCTF{}) `ioffdcjbfjmcifelcaloifgcjecgpgiebpfeiafhgajafkmlfcbpfbioflgcmacg` [new_vignere.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/new_vignere.py) --- Weโ€™re...

picoCTF, crypto, crypto/vigenere, crypto/bits
picoCTF
01 January 1337

Nsa Backdoor

I heard someone has been sneakily installing backdoors in open-source implementations of Diffie-Hellman... I wonder who it could be... ;)...

picoCTF, crypto, crypto/diffie-hellman, crypto/rsa, crypto/smooth-primes, crypto/pollard-attack
picoCTF
01 January 1337

Rsa Pop Quiz

Class, take your seats! It's PRIME-time for a quiz... `nc jupiter.challenges.picoctf.org 18821` --- Connect to the service. The first problem...

picoCTF, crypto, crypto/rsa
picoCTF
01 January 1337

Scrambled Rsa

Hmmm I wonder if you have learned your lesson... Let's see if you understand RSA and how the encryption works....

picoCTF, crypto, crypto/rsa, crypto/brute-force, crypto/byte-by-byte
picoCTF
01 January 1337

Sra

I just recently learnt about the SRA public key cryptosystem... or wait, was it supposed to be RSA? Hmmm, I...

picoCTF, crypto, crypto/rsa, crypto/factorization, crypto/brute-force
picoCTF
01 January 1337

Sum O Primes

We have so much faith in RSA we give you not just the product of the primes, but their sum...

picoCTF, crypto, crypto/rsa
picoCTF
01 January 1337

Very Smooth

Forget safe primes... Here, we like to live life dangerously... >:) - [gen.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/very-smooth-gen.py) - [output.txt](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/very-smooth-output.txt) --- Weโ€™re given two files,...

picoCTF, crypto, crypto/rsa, crypto/smooth-primes, crypto/pollard-attack
picoCTF
01 January 1337

Waves Over Lambda

We made a lot of substitutions to encrypt this. Can you decrypt it? Connect with `nc jupiter.challenges.picoctf.org 13758`. --- Connecting...

picoCTF, crypto, crypto/monoalphabetic-substitution
picoCTF
01 January 1337

Operation Oni

Download this disk image, find the key and log into the remote machine. Note: if you are using the webshell,...

picoCTF, forensics, forensics/disk, forensics/permissions
picoCTF
01 January 1337

Operation Orchid

Download this disk image and find the flag. Note: if you are using the webshell, download and extract the disk...

picoCTF, forensics, forensics/disk, forensics/openssl
picoCTF
01 January 1337

Sidechannel

There's something fishy about this PIN-code checker, can you figure out the PIN and get the flag? Download the PIN...

picoCTF, forensics, forensics/side-channel, forensics/timing
picoCTF
01 January 1337

Whitepages

I stopped using YellowPages and moved onto WhitePages... but the page they gave me is all blank! [whitepages.txt](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/whitepages.txt) --- ```xxd...

picoCTF, forensics, forensics/unicode, forensics/binary
picoCTF
01 January 1337

picoCTF

[picoCTF](https://picoctf.org/) This was the CTF I first started off with! In early July 2023 I was introduced to picoCTF and...

picoCTF
picoCTF
01 January 1337

Otp Implementation

Yay reversing! Relevant files: [otp](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/otp) [flag.txt](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/otp-flag.txt) --- We're given an ELF binary `otp` and a `flag.txt` that contains the encrypted...

picoCTF, rev, rev/otp, rev/byte-by-byte
picoCTF
01 January 1337

Reverse Cipher

We have recovered a [binary](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/rev-cipher-rev) and a [text file](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/picoCTF/rev-cipher-rev_this). Can you reverse the flag. --- We're given an ELF binary...

picoCTF, rev
picoCTF
01 January 1337

Irish Name Repo 1

There is a website running at https://jupiter.challenges.picoctf.org/problem/50009/ ([link](https://jupiter.challenges.picoctf.org/problem/50009/)) or http://jupiter.challenges.picoctf.org:50009. Do you think you can log us in? Try to...

picoCTF, web, web/sql-injection
picoCTF
01 January 1337

Irish Name Repo 2

There is a website running at https://jupiter.challenges.picoctf.org/problem/53751/ ([link](https://jupiter.challenges.picoctf.org/problem/53751/)). Someone has bypassed the login before, and now it's being strengthened. Try...

picoCTF, web, web/sql-injection
picoCTF
01 January 1337

Irish Name Repo 3

There is a secure website running at https://jupiter.challenges.picoctf.org/problem/40742/ ([link](https://jupiter.challenges.picoctf.org/problem/40742/)) or http://jupiter.challenges.picoctf.org:40742. Try to see if you can login as admin!...

picoCTF, web, web/sql-injection, web/curl
picoCTF
01 January 1337

Roboto Sans

The flag is somewhere on this web application not necessarily on the website. Find it. Check [this](http://saturn.picoctf.net:63195/) out. --- After...

picoCTF, web, web/robots.txt
picoCTF
01 January 1337

Secrets

We have several pages hidden. Can you find the one with the flag? The website is running [here](http://saturn.picoctf.net:62050/). --- `curl...

picoCTF, web, web/curl
1337UP-LIVE-CTF-2023
27 November 2023

Keyless

My friend made a new encryption algorithm. Apparently it's so advanced, you don't even need a key! [flag.txt.enc](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/1337UP-LIVE-CTF-2023/flag.txt.enc) [encrypt.py](https://github.com/Nightxade/ctf-writeups/assets/CTFs/1337UP-LIVE-CTF-2023/encrypt.py) ---...

1337UP-LIVE-CTF-2023, crypto, rev
1337UP-LIVE-CTF-2023
27 November 2023

Not So Smooth

Can you find a and b? [notsosmooth.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/1337UP-LIVE-CTF-2023/notsosmooth.py) --- We're given the following: ```py from Crypto.Util.number import long_to_bytes from Crypto.Util.strxor import...

1337UP-LIVE-CTF-2023, crypto, crypto/xor, crypto/modular-arithmetic
1337UP-LIVE-CTF-2023
27 November 2023

Really Secure Apparently

Apparently this encryption is "really secure" and I don't need to worry about sharing the ciphertext, or even these values.....

1337UP-LIVE-CTF-2023, crypto, crypto/rsa, crypto/wiener
1337UP-LIVE-CTF-2023
27 November 2023

1337UP LIVE CTF 2023

[](https://ctftime.org/event/2134) Placement: #133/691 --- ## Thoughts: I had a lot of fun with this CTF! I didn't really solve anything...

1337UP-LIVE-CTF-2023
1337UP-LIVE-CTF-2023
27 November 2023

Flag Checker

Can you beat this FlagChecker? [flagchecker](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/1337UP-LIVE-CTF-2023/flagchecker) [source.rs](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/1337UP-LIVE-CTF-2023/source.rs) --- ### *Warning: if you came here for an elegant solution, this is...

1337UP-LIVE-CTF-2023, rev, rev/rust, rev/brute-force
1337UP-LIVE-CTF-2023
27 November 2023

Obfuscation

I think I made my code harder to read. Can you let me know if that's true? [obfuscation.zip](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/1337UP-LIVE-CTF-2023/obfuscation.zip) --- This...

1337UP-LIVE-CTF-2023, rev, rev/obfuscation, rev/xor
1337UP-LIVE-CTF-2023
27 November 2023

Encoding

I have no idea what this message means, can you help me decipher it? ๐Ÿ‘จโ€๐Ÿ’ป [enc.txt](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/1337UP-LIVE-CTF-2023/enc.txt) --- We're given a...

1337UP-LIVE-CTF-2023, crypto, crypto/encoding, crypto/base32, crypto/base64, crypto/hex, crypto/morse
1337UP-LIVE-CTF-2023
27 November 2023

Flag Extraction

They told me I just need to extract flag but I don't know what that means?! [flag.rar](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/1337UP-LIVE-CTF-2023/flag.rar) --- After extracting...

1337UP-LIVE-CTF-2023, forensics, forensics/rar, forensics/zip, forensics/binwalk
1337UP-LIVE-CTF-2023
27 November 2023

Over The Wire 1

I'm not sure how secure this protocol is but as long as we update the password, I'm sure everything will...

1337UP-LIVE-CTF-2023, forensics, forensics/network, forensics/wireshark, forensics/ftp
1337UP-LIVE-CTF-2023
27 November 2023

Over The Wire 2

Learning the lessons from the previous failed secure file transfer attempts, CryptoCat and 0xM4hm0ud found a new [definitely secure] way...

1337UP-LIVE-CTF-2023, forensics, forensics/network, forensics/wireshark, forensics/stego, forensics/lsb
Newport-Blake-CTF-2023
04 December 2023

Gym

Bro kroot. Ignore the time/memory/input/output section of the pdf. `nc chal.nbctf.com 30270` [gym.pdf](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/algo/gym.pdf) --- Okay, so we're given a sequence...

Newport-Blake-CTF-2023, algo, algo/greedy
Newport-Blake-CTF-2023
04 December 2023

32+32=64

64 is too much, but 32 isn't. 32+32=64? [32_1.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/crypto/32_1.txt) [32_2.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/crypto/32_2.txt) --- We're given two base64 strings. Each of them, when...

Newport-Blake-CTF-2023, crypto, crypto/base64
Newport-Blake-CTF-2023
04 December 2023

Caesar Salads

Every CTF needs an introductory crypto. I found a roman emperor that made this super cool cipher. Can you decrypt...

Newport-Blake-CTF-2023, crypto, crypto/caesar
Newport-Blake-CTF-2023
04 December 2023

Rivest Shamir Forgot Adleman

Exponents took too long. I decided to use an alternative. It won't about the same right? https://en.wikipedia.org/wiki/RSA(cryptosystem) [output.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/crypto/rsa-output.txt) [chall.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/crypto/rsa-chall.py) ---...

Newport-Blake-CTF-2023, crypto, crypto/rsa, crypto/broken-rsa
Newport-Blake-CTF-2023
04 December 2023

Sbg Abw's Insanity

"Skill Issue" - AnonymousBlueWhale [output.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/crypto/sbg-abw-output.txt) [chall.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/crypto/sbg-abw-chall.py) --- We're given `chall.py` and `output.txt`. Here's `chall.py`: ```py from Crypto.Util.number import getPrime, bytes_to_long,...

Newport-Blake-CTF-2023, crypto, crypto/rsa
Newport-Blake-CTF-2023
04 December 2023

Newport Blake CTF 2023

[](https://ctftime.org/event/2072) Overall Placement: #29/451 High School Placement: #8/39 --- ## Thoughts: First high school CTF! Overall, I think I did...

Newport-Blake-CTF-2023
Newport-Blake-CTF-2023
04 December 2023

Do You Hear That

I'm not sure why, but when I look at this image I can hear some sort of faint sound. Do...

Newport-Blake-CTF-2023, misc, forensics, misc/audio-forensics
Newport-Blake-CTF-2023
04 December 2023

Not Accepted

I can't seem to pass this problem... can you help me? [https://codeforces.com/contestInvitation/9cf6e56adf19ecb8e5dd7af8a9c5bf5610c8e46e](https://codeforces.com/contestInvitation/9cf6e56adf19ecb8e5dd7af8a9c5bf5610c8e46e) --- We're given an odd Codeforces problem: Simply...

Newport-Blake-CTF-2023, misc, misc/codeforces
Newport-Blake-CTF-2023
04 December 2023

Babbling About

They say a monkey with a typewriter will eventually type out a masterpiece. But what about a flag? Enclose the...

Newport-Blake-CTF-2023, osint, osint/babel
Newport-Blake-CTF-2023
04 December 2023

Linkedout 1

Iโ€™ve just finished setting up Newport blakes LinkedIn! I hope I didn't give away too much personal information in my...

Newport-Blake-CTF-2023, osint, osint/hex
Newport-Blake-CTF-2023
04 December 2023

Linkedout 3

Lets see your linkedin experience. There's another flag hidden somewhere, lets see if you can find it. --- Take a...

Newport-Blake-CTF-2023, osint, osint/hex
Newport-Blake-CTF-2023
04 December 2023

Persona

I have this username, can you help me uncover who it really is? They go by the name in2win9945 online....

Newport-Blake-CTF-2023, osint, osint/wayback-machine
Newport-Blake-CTF-2023
04 December 2023

Webcam

์ธํ„ฐ๋„ท์—์„œ ์›น์บ ์„ ์žƒ์–ด๋ฒ„๋ ธ์Šต๋‹ˆ๋‹ค. ์ •ํ™•ํžˆ ์–ด๋””์— ์žˆ๋Š”์ง€ ์•Œ๋ ค์ฃผ์‹ค ์ˆ˜ ์žˆ๋‚˜์š”? Flag is the coordinates of the location truncated to three digits,...

Newport-Blake-CTF-2023, osint, osint/google-maps
Newport-Blake-CTF-2023
04 December 2023

Crisscross

X [output.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/rev/output.txt) [main.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/rev/main.py) --- We're given `main.py` and `output.txt`. Here's `main.py`: ```py import random key1 = random.choices(range(256), k=20) key2 =...

Newport-Blake-CTF-2023, rev, rev/bits
Newport-Blake-CTF-2023
04 December 2023

Itchy Scratchy

Yeah sorry, I couldn't resist. Use Turbowarp if you want. [itchyscratchy.sb3](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/rev/itchyscratchy.sb3) --- Head over to Turbowarp and load the Scratch...

Newport-Blake-CTF-2023, rev, rev/Scratch, rev/brute-force
Newport-Blake-CTF-2023
04 December 2023

Shifty Sands

Can you escape the sand-filled maze before it's too late? `nc chal.nbctf.com 30401` [sands](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/rev/sands) --- We're given an ELF binary,...

Newport-Blake-CTF-2023, rev, rev/maze
Newport-Blake-CTF-2023
04 December 2023

Inspector Gadget

While snooping around this website, inspector gadet lost parts of his flag. Can you help him find it? [inspector-gadget.chal.nbctf.com](inspector-gadget.chal.nbctf.com) ---...

Newport-Blake-CTF-2023, web, web/inspect
Newport-Blake-CTF-2023
04 December 2023

Secret Tunnel

Can you find the flag on the other end of my secret tunnel? [secret-tunnel.chal.nbctf.com](secret-tunnel.chal.nbctf.com) [secret_tunnel.zip](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/web/secret-tunnel.zip) --- We're given a website...

Newport-Blake-CTF-2023, web, web/localhost, web/url-encoding
Newport-Blake-CTF-2023
04 December 2023

Walter's Crystal Shop

My buddy Walter is selling some crystals, check out his shop! [walters-crystal-shop.chal.nbctf.com](walters-crystal-shop.chal.nbctf.com) [walters_crystal_shop.zip](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Newport-Blake-CTF-2023/web/walters_crystal_shop.zip) --- The source includes an `app.js` file....

Newport-Blake-CTF-2023, web, web/SQLi, web/sql-union
Hackappatoi-CTF-2023
10 December 2023

Hackappatoi CTF 2023

[](https://ctftime.org/event/2163) #116/443 --- ## Thoughts: Didn't have much time to play this CTF, but I did still manage to solve...

Hackappatoi-CTF-2023
Hackappatoi-CTF-2023
10 December 2023

Escape From Italy

Italy is maybe the most touristic country around the world, amazing food, spectacular monuments, and faboulus environments But in the...

Hackappatoi-CTF-2023, misc, misc/pyjail, misc/ruby-jail
Hackappatoi-CTF-2023
10 December 2023

Italian Mail

Enzo Tommasi was a YouTube "superstar" in Italy. He went viral with this video initially and then with many others....

Hackappatoi-CTF-2023, osint, osint/google-maps
Hackappatoi-CTF-2023
10 December 2023

The First Horseman

I donโ€™t think youโ€™re welcome inside this castleโ€ฆ SHISH! [thefirsthorseman](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Hackappatoi-CTF-2023/thefirsthorseman38.pyc) --- We're provided a `.pyc` file. For those who are...

Hackappatoi-CTF-2023, rev, rev/pyc, rev/rot13
Hackappatoi-CTF-2023
10 December 2023

The Four Horseman

The Cavaliere is returned. He is awake and heโ€™s ready to unleash the apocalypse. Are you the chosen one? Solving...

Hackappatoi-CTF-2023, rev, rev/rot13
Hackappatoi-CTF-2023
10 December 2023

Lemons

Perhaps not everyone knows that Italy produces top-quality lemons. No wonder that forgetting them at the counter is a very...

Hackappatoi-CTF-2023, web, web/robots.txt
ping-CTF-2023
11 December 2023

Hard Work

You've received a cryptic message from your boss at the company. Apparently, your aggressive demeanor has raised concerns, and your...

ping-CTF-2023, crypto, crypto/encoding
ping-CTF-2023
11 December 2023

Lame Lame Loser

In this challenge, your school teacher dismissed your abilities by calling you a lame loser. Now, you have the chance...

ping-CTF-2023, crypto, crypto/lll
ping-CTF-2023
11 December 2023

Old Friend From The Past

You've stumbled upon an encrypted message from the past, a mysterious code left behind by a figure from history. Your...

ping-CTF-2023, crypto, crypto/caesar
ping-CTF-2023
11 December 2023

Private Conversation

Welcome to the "private-conversation" challenge, where you find yourself in the role of a cryptanalyst facing an intriguing encrypted message....

ping-CTF-2023, crypto, crypto/encoding, crypto/obfuscation
ping-CTF-2023
11 December 2023

ping CTF 2023

[](https://ctftime.org/event/1987) Overall Placement: #63/517 --- ## Thoughts: This was a fun CTF! I was admittedly a little frustrated with my...

ping-CTF-2023
ping-CTF-2023
11 December 2023

Inside Bear

This is the hardest reversing challenge I've ever met!!! Can you please help me? It even has source code attached...

ping-CTF-2023, misc, misc/binwalk, misc/audio-forensics, misc/spectrogram
ping-CTF-2023
11 December 2023

Imag Ine An Elf

This is no ordinary reversing challenge! As the Christmas season is coming, we thought that a real elf would be...

ping-CTF-2023, rev, rev/lsb
ping-CTF-2023
11 December 2023

Noodle Nightmare

In the last programming session, Bajtek unleashed a coding catastrophe โ€“ his spaghetti code was so messy that even the...

ping-CTF-2023, rev, rev/obfuscation
ping-CTF-2023
11 December 2023

Ziggarettes

Don't smoke zigarettes, kids! [e0d8bf8fdefc32df23a1c96f047c50fc.zip](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/ping-CTF-2023/e0d8bf8fdefc32df23a1c96f047c50fc.zip) --- We're given an ELF binary. I decompiled with [Dogbolt](https://dogbolt.org/) and examined the Ghidra code....

ping-CTF-2023, rev, rev
ping-CTF-2023
11 December 2023

Path Traversal 101

Can you pass the path traversal exam? ๐Ÿ‘€ There might be some requirements tho for your *specie*... [https://path-traversal-101.knping.pl](https://path-traversal-101.knping.pl) [ec96a2a4ee45dd97dfa37319f21468a3.zip](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/ping-CTF-2023/ec96a2a4ee45dd97dfa37319f21468a3.zip) ---...

ping-CTF-2023, web, web/robots.txt, web/path
ping-CTF-2023
11 December 2023

Youtube Trailer

Watch the [PING CTF 2023 official trailer](https://www.youtube.com/watch?v=siZPvEGrtNY) and find the flag! --- Nothing on the video seemed to indicate a...

ping-CTF-2023, web, web/curl
Cyber-Cooperative-CTF-2023
19 December 2023

Slots

I heard about this [scam that let people rob some slot machines](https://www.wired.com/2017/02/russians-engineer-brilliant-slot-machine-cheat-casinos-no-fix/). Can you do it with this slot machine?...

Cyber-Cooperative-CTF-2023, crypto, crypto/randcrack
Cyber-Cooperative-CTF-2023
19 December 2023

Babyhide

This little baby is figuring out how to computer! It looks like the baby hid some of my files though....

Cyber-Cooperative-CTF-2023, forensics, forensics/binwalk
Cyber-Cooperative-CTF-2023
19 December 2023

Funding Secured

Someone in our company leaked some very sensitive information. We absolutely cannot let this stand. Thankfully our monitoring software intercepted...

Cyber-Cooperative-CTF-2023, forensics, forensics/lsb, forensics/binwalk
Cyber-Cooperative-CTF-2023
19 December 2023

Lost At Sea

I dropped my flag in the sea. Help me find it among the sharks! [lost-at-sea.pcapng](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Cyber-Cooperative-CTF-2023/forensics/lost-at-sea.pcapng) --- We're given a very...

Cyber-Cooperative-CTF-2023, forensics, forensics/wireshark
Cyber-Cooperative-CTF-2023
19 December 2023

Cyber Cooperative CTF 2023

[](https://ctftime.org/event/2206) #121/432 --- ## Thoughts: I didn't perform too well on this CTF, but was still fun! I think I...

Cyber-Cooperative-CTF-2023
Cyber-Cooperative-CTF-2023
19 December 2023

Crashme

Can you make this program crash? `nc 0.cloud.chals.io 17289` [crashme](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Cyber-Cooperative-CTF-2023/pwn/crashme) [crashme.c](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Cyber-Cooperative-CTF-2023/pwn/crashme.c) --- We're given an ELF binary, a C source...

Cyber-Cooperative-CTF-2023, pwn, pwn/buffer-overflow, pwn/segfault
Cyber-Cooperative-CTF-2023
19 December 2023

Medbof

a little harder this time `nc 0.cloud.chals.io 27380` [medbof](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Cyber-Cooperative-CTF-2023/pwn/medbof) --- We're given an ELF binary, `medbof`. I decompiled with [Dogbolt](https://dogbolt.org/)....

Cyber-Cooperative-CTF-2023, pwn, pwn/buffer-overflow, pwn/ret2win
Cyber-Cooperative-CTF-2023
19 December 2023

Bunker

You reach a large metal door. It's protected by large yellow bars. There appears to be an panel with a...

Cyber-Cooperative-CTF-2023, rev, rev/jar
Cyber-Cooperative-CTF-2023
19 December 2023

Dis

Our field agents extracted the disassembly for a function that we think generates a secret flag. But it doesn't look...

Cyber-Cooperative-CTF-2023, rev, rev/bytecode
Cyber-Cooperative-CTF-2023
19 December 2023

Easycrack

I need to make a key for this crackme for my homework. I just want to play video games, can...

Cyber-Cooperative-CTF-2023, rev
Iris-CTF-2024
07 January 2024

Baby Charge

For your first assignment, break ChaCha20! `nc babycha.chal.irisc.tf 10100` [babycha.tar.gz](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Iris-CTF-2024/babycha.tar.gz) --- We're given an encryption oracle with two options --...

Iris-CTF-2024, crypto, crypto/chacha20, crypto/oracle
Iris-CTF-2024
07 January 2024

Integral Communication

I've found this secret communication system running on a server. Unfortunately it uses AES so there's not much I can...

Iris-CTF-2024, crypto, crypto/aes, crypto/aes-cbc, crypto/oracle, crypto/json
Iris-CTF-2024
07 January 2024

Iris CTF 2024

[](https://ctftime.org/event/2085) Placement: #88/1207 --- ## Thoughts: Turns out I'm a speed demon in the first few hours of the CTF,...

Iris-CTF-2024
Iris-CTF-2024
07 January 2024

Name That Song 3

No more modarchive. Find the original title of this song which has been redacted from this file. Format: irisctf{never_gonna_give_you_up} Song...

Iris-CTF-2024, misc, misc/reverse-audio-search
Iris-CTF-2024
07 January 2024

Sir Scope

This circuit used to write out the flag using an array of 8 LEDs, but the LEDs are all burnt...

Iris-CTF-2024, misc, misc/brute-force
Iris-CTF-2024
07 January 2024

Wheres Skat

While traveling over the holidays, I was doing some casual wardriving (as I often do). Can you use my capture...

Iris-CTF-2024, forensics, forensics/network, osint, forensics/wifi
Iris-CTF-2024
07 January 2024

Away On Vacation

Iris and her assistant are away on vacation. She left an audio message explaining how to get in touch with...

Iris-CTF-2024, osint, osint/instagram
Iris-CTF-2024
07 January 2024

Czech Where

Iris visited this cool shop a while back, but forgot where it was! What street is it on? [czech-where.tar.gz](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Iris-CTF-2024/czech-where.tar.gz) ---...

Iris-CTF-2024, osint, osint/reverse-image-search
Iris-CTF-2024
07 January 2024

Personal Breach

Security questions can be solved by reconnaissance. The weakest link in security could be the people around you. [https://personal-breach-web.chal.irisc.tf/](https://personal-breach-web.chal.irisc.tf/) ---...

Iris-CTF-2024, osint, osint/instgram, osint/linkedin, osint/facebook
Iris-CTF-2024
07 January 2024

Insanity Check

I've tried the brand new michael-ld linker on my hello world program. I'm pretty sure it's super safe now. `nc...

Iris-CTF-2024, pwn, pwn/buffer-overflow, pwn/ret2win
Iris-CTF-2024
07 January 2024

Rune Whats That

Rune? Like the ancient alphabet? [whats-a-rune.tar.gz](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Iris-CTF-2024/whats-a-rune.tar.gz) --- We're given two files, `the` and `main.go`. `the` is filled with some odd...

Iris-CTF-2024, rev, rev/go
Iris-CTF-2024
07 January 2024

The Johnsons

Please socialize with the Johnson's and get off your phone. You might be quizzed on it! `nc babyrevjohnson.chal.irisc.tf 10002` [babyrevjohnson.tar.gz](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Iris-CTF-2024/babyrevjohnson.tar.gz)...

Iris-CTF-2024, rev, rev/logic
Iris-CTF-2024
07 January 2024

Whats My Password

[baby] Oh no! Skat forgot their password (again)! Can you help them find it? [https://whats-my-password-web.chal.irisc.tf/](https://whats-my-password-web.chal.irisc.tf/) [whats-my-password.tar.gz](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Iris-CTF-2024/whats-my-password.tar.gz) --- We're given a...

Iris-CTF-2024, web, web/sqli, web/union
UofT-CTF-2024
15 January 2024

Clever Thinking

I think that Diffie-Hellman is better with some curves, maybe elliptic ones. Let's share a secret! Wrap the secret (which...

UofT-CTF-2024, crypto, crypto/ecc, crypto/smarts-attack
UofT-CTF-2024
15 January 2024

Piano Man

Windy, a piano prodigy, believes that RSA encryption may not provide sufficient security to safeguard his invaluable piano mastery secrets....

UofT-CTF-2024, crypto, crypto/rsa
UofT-CTF-2024
15 January 2024

Repeat

I'm a known repeat offender when it comes to bad encryption habits. But the secrets module is secure, so you'll...

UofT-CTF-2024, crypto, crypto/xor
UofT-CTF-2024
15 January 2024

Enable Me

You've received a confidential document! Follow the instructions to unlock it. Note: This is not malware Author: SteakEnthusiast [invoice.docm](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/UofT-CTF-2024/invoice.docm) ---...

UofT-CTF-2024, forensics, forensics/microsoft-office
UofT-CTF-2024
15 January 2024

Secret Message 1

We swiped a top-secret file from the vaults of a very secret organization, but all the juicy details are craftily...

UofT-CTF-2024, forensics
UofT-CTF-2024
15 January 2024

UofT CTF 2024

[](https://ctftime.org/event/2219) Placement: #175/1225 --- ## Thoughts: Didn't have as much time to play this one, but still had fun! Crypto...

UofT-CTF-2024
UofT-CTF-2024
15 January 2024

Babys First Iot Flag 1

See introduction for complete context. Part 1 - Here is an FCC ID, Q87-WRT54GV81, what is the frequency in MHz...

UofT-CTF-2024, osint, osint/iot, osint/fcc-lookup
UofT-CTF-2024
15 January 2024

Babys First Iot Flag 2

See introduction for complete context. Part 2 - What company makes the processor for this device? [https://fccid.io/Q87-WRT54GV81/Internal-Photos/Internal-Photos-861588](https://fccid.io/Q87-WRT54GV81/Internal-Photos/Internal-Photos-861588). Submit the answer...

UofT-CTF-2024, osint, osint/iot, osint/reverse-image-search
UofT-CTF-2024
15 January 2024

Babys First Pyjail

@windex told me that jails should be sourceless. So no source for you. Author: SteakEnthusiast `nc 35.226.249.45 5000` --- We're...

UofT-CTF-2024, misc, misc/pyjail, misc/blacklist
UofT-CTF-2024
15 January 2024

Out Of The Bucket

Check out my flag website! Author: windex [https://storage.googleapis.com/out-of-the-bucket/src/index.html](https://storage.googleapis.com/out-of-the-bucket/src/index.html) --- We're given a [website](https://storage.googleapis.com/out-of-the-bucket/src/index.html) Checking out the website reveals two images...

UofT-CTF-2024, misc, misc/Google-storage
UofT-CTF-2024
15 January 2024

Flying High

I'm trying to find a flight I took back in 2012. I forgot the airport and the plane, but I...

UofT-CTF-2024, osint
UofT-CTF-2024
15 January 2024

Basic Overflow

This challenge is simple. It just gets input, stores it to a buffer. It calls gets to read input, stores...

UofT-CTF-2024, pwn, pwn/ret2win, pwn/buffer-overflow
UofT-CTF-2024
15 January 2024

Patched Shell

Okay, okay. So you were smart enough to do basic overflow huh... Now try this challenge! I patched the shell...

UofT-CTF-2024, pwn, pwn/ret2win, pwn/buffer-overflow
Dice-CTF-Quals-2024
04 February 2024

Winter

A simple implementation of the Winternitz signature scheme. `nc mc.ax 31001` [server.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Dice-CTF-Quals-2024/server.py) --- We're provided a single file, `server.py`: ```py...

Dice-CTF-Quals-2024, crypto, crypto/winternitz, crypto/signature
Dice-CTF-Quals-2024
04 February 2024

Dice CTF Quals 2024

[](https://ctftime.org/event/2217) Placement: #167/1040 overall, #7/50 high school --- ## Thoughts: Didn't dedicate a ton of time to this, but some...

Dice-CTF-Quals-2024
Dice-CTF-Quals-2024
04 February 2024

Zshfuck

may your code be under par. execute the getflag binary somewhere in the filesystem to win `nc mc.ax 31774` [jail.zsh](https://gthub.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Dice-CTF-Quals-2024/jail.zshs)...

Dice-CTF-Quals-2024, misc, misc/jail, misc/zsh
Dice-CTF-Quals-2024
04 February 2024

Dicedicegoose

Follow the leader. [ddg.mc.ax](https://ddg.mc.ax/) --- Visit the site. Seems like some sort of game. Heading to Chrome Dev Tools with...

Dice-CTF-Quals-2024, web, web/inspect
0xL4ugh-CTF-2024
10 February 2024

Poison

Author : mindFlayer02 [source.sage](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/0xL4ugh-CTF-2024/source.sage) [out.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/0xL4ugh-CTF-2024/out.txt) --- We are provided a sage source file and an output file. Here's the source:...

0xL4ugh-CTF-2024, crypto, crypto/elliptic-curve
0xL4ugh-CTF-2024
10 February 2024

Rsa Gcd

I think i might leaked something but i dont know what Author : Bebo07 [chall2.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/0xL4ugh-CTF-2024/chall2.txt) [chall2.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/0xL4ugh-CTF-2024/chall2.py) --- We're given a...

0xL4ugh-CTF-2024, crypto, crypto/rsa, crypto/gcd
0xL4ugh-CTF-2024
10 February 2024

0xL4ugh CTF 2024

[](https://ctftime.org/event/2216) Placement: #98/614 --- ## Thoughts: First time playing with a team (reCAPTCHA the Flag). Unfortunately, the other members didn't...

0xL4ugh-CTF-2024
Vishwa-CTF-2024
03 March 2024

Bitbane Cryptic Chaos

Once again, Mr. David made a blunder by encrypting some confidential data and deleting the original file. Can you help...

Vishwa-CTF-2024, crypto, crypto/brute-force
Vishwa-CTF-2024
03 March 2024

Intellectual Heir

You received a package, and you got to know that you are the descendant of RIADSH. There are four files...

Vishwa-CTF-2024, crypto, crypto/rsa
Vishwa-CTF-2024
03 March 2024

Lets Smother The King

In my friend circle, Mr. Olmstead and Mr. Ben always communicate with each other through a secret code language that...

Vishwa-CTF-2024, crypto, crypto/esoteric-language
Vishwa-CTF-2024
03 March 2024

Poly Fun

Its a simple symmetric key encryption, I am sure you will be able to solve it (what do you mean...

Vishwa-CTF-2024, crypto
Vishwa-CTF-2024
03 March 2024

Tevyat Tales

All tavern owners in Mondstadt are really worried because of the frequent thefts in the Dawn Winery cellars. The Adventurersโ€™...

Vishwa-CTF-2024, crypto, crypto/decoder, crypto/enigma
Vishwa-CTF-2024
03 March 2024

Vishwa CTF 2024

[](https://ctftime.org/event/2272) Placement: #116/1039 --- ## Thoughts: 2nd event with team reCAPTCHA the Flag! Only looked at the crypto category for...

Vishwa-CTF-2024
Wolv-CTF-2024
19 March 2024

Crypto Two Time Pad

One-time pads are perfectly information-theoretically secure, so I should be safe, right? [chall.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/chall.py) [eFlag.bmp](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/eFlag.bmp) [eWolverine.bmp](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/eWolverine.bmp) --- We're provided a Python...

Wolv-CTF-2024, crypto, crypto/otp
Wolv-CTF-2024
19 March 2024

Crypto Yors Truly

I have encrypted some text but it seems I have lost the key! Can you find it? [yors-truly.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/yors-truly.py) --- We're...

Wolv-CTF-2024, crypto, crypto/xor
Wolv-CTF-2024
19 March 2024

Forensics Hidden Data

WOLPHV sent me this file. Not sure what to comment about it [wctf_evil.jpg](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/wctf_evil.jpg) --- Run `strings wctf_evil.jpg | grep "wctf"`....

Wolv-CTF-2024, forensics, forensics/strings
Wolv-CTF-2024
19 March 2024

Osint Redditor

Someone told me WolvSec has a Reddit account. I wonder if they left a flag there... --- Search `wolvsec reddit`...

Wolv-CTF-2024, osint
Wolv-CTF-2024
19 March 2024

Pwn Babypwn

Just a little baby pwn. `nc babypwn.wolvctf.io 1337 ` [babypwn](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/babypwn) [babypwn.c](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/babypwn.c) --- We're provided a binary ELF and a C...

Wolv-CTF-2024, pwn, pwn/buffer-overflow
Wolv-CTF-2024
19 March 2024

Pwn Babypwn2

A harder babypwn. `nc babypwn2.wolvctf.io 1337 ` [babypwn2](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/babypwn2) [babypwn2.c](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/babypwn2.c) --- We're provided a binary ELF and a C source file....

Wolv-CTF-2024, pwn, pwn/buffer-overflow, pwn/ret2win, pwn/gets
Wolv-CTF-2024
19 March 2024

Rev Babyre

Just a wee-little baby re challenge. [babyre](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/beginner/babyre) --- No rev required! Run `strings babyre | grep "wctf"` to get the...

Wolv-CTF-2024, rev, rev/strings
Wolv-CTF-2024
19 March 2024

Rev Shredded

We encoded a flag, and to make sure that pesky interlopers couldn't reverse it, we shredded the encoding code. Note:...

Wolv-CTF-2024, rev, rev/brute-force, rev/byte-by-byte
Wolv-CTF-2024
19 March 2024

Web The Gauntlet

Can you survive the gauntlet? 10 mini web challenges are all that stand between you and the flag. Note: Automated...

Wolv-CTF-2024, web
Wolv-CTF-2024
19 March 2024

Blocked 1

The WOLPHV group (yes, this is an actual article) group encrypted our files, but then blocked us for some reason....

Wolv-CTF-2024, crypto, crypto/aes, crypto/aes-cbc, crypto/oracle
Wolv-CTF-2024
19 March 2024

Blocked 2

We managed to log into doubledelete's email server. Hopefully this should give us some leads... `nc blocked2.wolvctf.io 1337` [server.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/crypto/blocked-2/server.py) ---...

Wolv-CTF-2024, crypto, crypto/aes, crypto/oracle, crypto/roll-your-own
Wolv-CTF-2024
19 March 2024

Limited 1

It's pretty easy to find random integers if you know the seed, but what if every second has a different...

Wolv-CTF-2024, crypto, crypto/random
Wolv-CTF-2024
19 March 2024

Limited 2

I was AFK when the flag was being encrypted, can you help me get it back? [NY_chal_time.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/crypto/limited-2/NY_chal_time.py) --- We're provided...

Wolv-CTF-2024, crypto, crypto/random, crypto/time
Wolv-CTF-2024
19 March 2024

Tag Series 1

Don't worry, the interns wrote this one. `nc tagseries1.wolvctf.io 1337` [chal.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/crypto/tag-series-1/chal.py) --- We're provided a Python source: ```py import sys...

Wolv-CTF-2024, crypto, crypto/aes, crypto/aes-ecb, crypto/oracle
Wolv-CTF-2024
19 March 2024

Tag Series 3

Surely they got it right this time. `nc tagseries3.wolvctf.io 1337` [chal.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Wolv-CTF-2024/crypto/tag-series-3/chal.py) --- We're provided a Python source file: ```py import...

Wolv-CTF-2024, crypto, crypto/hash, crypto/sha1, crypto/length-extension-attack
Wolv-CTF-2024
19 March 2024

Wolv CTF 2024

[](https://ctftime.org/event/2240) Placement: #88/622 --- ## Thoughts: Didn't have too much time to do this CTF, especially since I was heading...

Wolv-CTF-2024
Wolv-CTF-2024
19 March 2024

Made Sense

i couldn't log in to my server so my friend kindly spun up a server to let me test makefiles....

Wolv-CTF-2024, misc, misc/jail, misc/makefile
Wolv-CTF-2024
19 March 2024

Wolphv I Reconaissance

A new ransomware group you may have heard about has emerged: WOLPHV There's already been reports of their presence in...

Wolv-CTF-2024, osint
Jersey-CTF-IV-2024
25 March 2024

Aces Aes

- The attached files were recovered from an attack committed by the malicious AI named RB. - The first file...

Jersey-CTF-IV-2024, crypto, crypto/aes, osint
Jersey-CTF-IV-2024
25 March 2024

Adversary

You have intercepted an encrypted message from the RB back to Dr. Tom!!!! The component values of Dr. Tom's public...

Jersey-CTF-IV-2024, crypto, crypto/rsa
Jersey-CTF-IV-2024
25 March 2024

Attn Agents

We heard a distress call and received a transmission. Only this text came through. You better take a look at...

Jersey-CTF-IV-2024, crypto, crypto/caesar
Jersey-CTF-IV-2024
25 March 2024

Mutant Mayhem

To prevent the RB from impersonating any communications coming from you to our team, we need to employ an extremely...

Jersey-CTF-IV-2024, crypto, crypto/ecc, crypto/secp256k1, crypto/signature
Jersey-CTF-IV-2024
25 March 2024

Vibrations

While managing some of our thermal systems, we noticed unusual behavior. We collected the network traffic, see if you can...

Jersey-CTF-IV-2024, forensics, forensics/network, forensics/wireshark, forensics/tcp, forensics/modbus
Jersey-CTF-IV-2024
25 March 2024

Jersey CTF IV 2024

[](https://ctftime.org/event/2230) Placement: #12/520 --- ## Thoughts: TL;DR: I got trolled by crypto but clutched on osint. Played with reCAPTCHA the...

Jersey-CTF-IV-2024
Jersey-CTF-IV-2024
25 March 2024

Cyber Daddy

We're still trying to figure out who tom's new friend is. Did you dig into them from the forums? They...

Jersey-CTF-IV-2024, osint, osint/instagram
Jersey-CTF-IV-2024
25 March 2024

The Golden Falcon And The Rugged Lands

- Okay, this is weird. They had a whole forum going. - There must be something worthwhile in there. We...

Jersey-CTF-IV-2024, osint
Texsaw-CTF-2024
25 March 2024

Freaky Flags

Password manager? I store all of mine in image form. [freakyFlags.png](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Texsaw-CTF-2024/freakyFlags.png) --- Import the image into MS Paint or any...

Texsaw-CTF-2024, crypto, crypto/rgb
Texsaw-CTF-2024
25 March 2024

Texsaw CTF 2024

[](https://ctftime.org/event/2281) Placement: #15/410 --- ## Thoughts: TL;DR: Crypto challenges were... questionable. Played with reCAPTCHA the Flag!

Texsaw-CTF-2024
Texsaw-CTF-2024
25 March 2024

Prison Italiano

You've been locked in the worst prison imaginable: one without any meatballs! To escape the prison, you must read the...

Texsaw-CTF-2024, misc, misc/pyjail
Texsaw-CTF-2024
25 March 2024

Geo Location

Find what street this picture was taken from. Format the flag as the following: The street name in all caps...

Texsaw-CTF-2024, osint
Texsaw-CTF-2024
25 March 2024

Sherlock

I need to study for a class but the quizlet I'm using has jumbled up answers that just don't make...

Texsaw-CTF-2024, osint, osint/vigenere
Texsaw-CTF-2024
25 March 2024

Ask And It Shall Be Given To You

The flag is at 3.23.56.243:9008. Unfortunately it seems like the site is down right now :( . Maybe you can...

Texsaw-CTF-2024, web, web/robots.txt, web/error, web/post
Texsaw-CTF-2024
25 March 2024

Extreme Security

We are at 3.23.56.243:9003. We are so secure that we only allow requests from our own origin to access secret...

Texsaw-CTF-2024, web, web/headers
Texsaw-CTF-2024
25 March 2024

Over 9000

Help Goku get over 9000 energy to defeat his enemy Vegeta and save the world. 3.23.56.243:9005 --- Visit the site....

Texsaw-CTF-2024, web, web/post
UT-CTF-2024
01 April 2024

Beginner Anti Dcode.fr

I've heard that everyone just uses dcode.fr to solve all of their crypto problems. Shameful, really. This is really just...

UT-CTF-2024, crypto, crypto/caesar
UT-CTF-2024
01 April 2024

Cryptordle

Just guess the word in 6 tries. What do you mean it's hard? By oops (former ISSS officer) Officer in...

UT-CTF-2024, crypto, crypto/math
UT-CTF-2024
01 April 2024

Numbers Go Brr 2

A spiritual successor the first. By jocelyn (@jocelyn3270 on discord) `nc betta.utctf.live 2435` [main-brr2.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/UT-CTF-2024/main-brr2.py) --- We're provided a Python source...

UT-CTF-2024, crypto, crypto/random, crypto/aes, crypto/oracle
UT-CTF-2024
01 April 2024

Numbers Go Brr

I wrote an amazing encryption service. It is definitely flawless, so I'll encrypt the flag and give it to you....

UT-CTF-2024, crypto, crypto/random, crypto/aes, crypto/oracle
UT-CTF-2024
01 April 2024

Rsa 256

Based on the military-grade encryption offered by AES-256, RSA-256 will usher in a new era of cutting-edge security... or at...

UT-CTF-2024, crypto, crypto/rsa
UT-CTF-2024
01 April 2024

Simple Signature

The s in rsa stands for secure. By alex (@kyrili : not the isss officer - someone y'all don't know)...

UT-CTF-2024, crypto, crypto/signature, crypto/forgery
UT-CTF-2024
01 April 2024

Gibberish

Help! I'm trying to spy on my lover but they're not typing in any language I'm familiar with! By mzone...

UT-CTF-2024, forensics, forensics/network, forensics/stenography
UT-CTF-2024
01 April 2024

UT CTF 2024

[](https://ctftime.org/event/2302) Placement: #8/854 --- ## Thoughts: Best CTF yet with my team reCAPTCHA the Flag! I completed all of the...

UT-CTF-2024
UT-CTF-2024
01 April 2024

Ccv

I've got some credit cards but I don't which ones are valid. Where did I get them? Uh, that's not...

UT-CTF-2024, misc, misc/credit-cards
UMD-CTF-2024
28 April 2024

Triple Des

Before the Kwisatz Haderach, the Bene Gesserit used this oracle to predict the future. `nc challs.umdctf.io 32333` [tripledes.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/UMD-CTF-2024/tripledes.py) --- We're...

UMD-CTF-2024, crypto, crypto/des, crypto/3des, crypto/padding-oracle
UMD-CTF-2024
28 April 2024

UMD CTF 2024

[](https://ctftime.org/event/2323) Placement: #28/562 --- ## Thoughts: Another CTF with reCAPTCHA the Flag! Solved 2 crypto and 1 pwn. The other...

UMD-CTF-2024
UMD-CTF-2024
28 April 2024

Mentat Question

Thufir Hawat is ready to answer any and all questions you have. Unless it's not about division... `nc challs.umdctf.io 32300`...

UMD-CTF-2024, pwn, pwn/buffer-overflow, pwn/gets, pwn/format-string, pwn/ret2win, pwn/PIE
squ1rrel-CTF-2024
28 April 2024

Lazy Rsa

Generating primes is too hard, but I did find a couple posted online! [lazyrsa.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/squ1rrel-CTF-2024/lazyrsa.txt) --- The provided txt file just...

squ1rrel-CTF-2024, crypto, crypto/rsa, crypto/factordb
squ1rrel-CTF-2024
28 April 2024

Partial Rsa

Hmm? What's wrong with using the same flag format again? Whisper it in my ear so they don't hear. [partialrsa.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/squ1rrel-CTF-2024/partialrsa.txt)...

squ1rrel-CTF-2024, crypto, crypto/rsa, crypto/coppersmith, crypto/stereotyped-message-attack
squ1rrel-CTF-2024
28 April 2024

Rsa Rsa Rsa

I had something so important to say that I just had to tell three of my friends! [rsarsarsa.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/squ1rrel-CTF-2024/rsarsarsa.txt) --- Here's...

squ1rrel-CTF-2024, crypto, crypto/rsa, crypto/hastad-broadcast-attack
squ1rrel-CTF-2024
28 April 2024

Squ1rrel Lottery

Welcome to the squ1rrel lottery! 9 winning numbers will be selected, and if any of your tickets share 3 numbers...

squ1rrel-CTF-2024, crypto
squ1rrel-CTF-2024
28 April 2024

Squ1rrel Treasury

We recently opened a new bank, our exchange rate is pretty poor though `nc treasury.squ1rrel-ctf-codelab.kctf.cloud 1337` [chall.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/squ1rrel-CTF-2024/chall.py) --- Here's chall.py:...

squ1rrel-CTF-2024, crypto, crypto/aes, crypto/cbc
squ1rrel-CTF-2024
06 May 2024

squ1rrel CTF 2024

[](https://ctftime.org/event/2370) Placement: #6/378 All, #2/44 Student Winnings: $150 --- ## Thoughts: Another CTF with reCAPTCHA the Flag! Cleared crypto (the...

squ1rrel-CTF-2024
TJ-CTF-2024
19 May 2024

Account Leak

Uncrackable password? I thought this was a CTF; get me my friends minecraft password pls i have an uncrackable password...

TJ-CTF-2024, crypto, crypto/rsa
TJ-CTF-2024
19 May 2024

Alkane

I hate standing in line for gas.... [output.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/alkane/output.txt) [main.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/alkane/main.py) --- Here's the Python source: ```py schedule = # ommitted because...

TJ-CTF-2024, crypto, crypto/matrix
TJ-CTF-2024
19 May 2024

Assume

assume for the sake of contradiction that pet the catloe [main.sage](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/assume/main.sage) [log.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/assume/log.txt) --- Here's the sage source: ```py import random...

TJ-CTF-2024, crypto
TJ-CTF-2024
19 May 2024

Hulksmash

my friends password is keysmash.... :(... i got some of his old keysmashes tho.... he types kinda funny.... [output.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/hulksmash/output.txt) [keysmashes.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/hulksmash/keysmashes.txt)...

TJ-CTF-2024, crypto
TJ-CTF-2024
19 May 2024

Iodomethane

AINT NO HILL HIGH ENOUGH.... [out.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/iodomethane/out.txt) [main.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/iodomethane/main.py) --- Here's the Python source: ```py import secrets flag = open("flag.txt", "r").read().strip() print(flag)...

TJ-CTF-2024, crypto, crypto/matrix
TJ-CTF-2024
19 May 2024

Lightweight Crypto Guard System

They said OTPs were too simple. [out.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/lightweight-crypto-guard-system/out.txt) [encode.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/lightweight-crypto-guard-system/encode.py) --- Before you begin reading this writeup, I highly, highly recommend you...

TJ-CTF-2024, crypto, crypto/lcg
TJ-CTF-2024
19 May 2024

Weird Crypto

weird crypto hmmm [a.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/weird-crypto/a.py) [output.txt](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/TJ-CTF-2024/weird-crypto/output.txt) --- Here's the Python source: ```py from math import lcm from Crypto.Util.number import bytes_to_long, getPrime...

TJ-CTF-2024, crypto, crypto/rsa, crypto/wiener
TJ-CTF-2024
19 May 2024

TJ CTF 2024

[](https://ctftime.org/event/2321) Placement: #5/19 HS, #25/518 all --- ## Thoughts: Played with reCAPTCHA the Flag! Lots of crypto challs, felt quite...

TJ-CTF-2024
BCA-CTF-2024
12 June 2024

Cha Cha Slide

I made this cool service that lets you protect your secrets with state-of-the-art encryption. It's so secure that we don't...

BCA-CTF-2024, crypto, crypto/chacha20
BCA-CTF-2024
12 June 2024

Cinnamon Dynamics

Cinnamon Dynamics, an innovative technology company, provides a service for the public to execute short scripts to query some limited...

BCA-CTF-2024, crypto, crypto/sha256, crypto/length-extension-attack
BCA-CTF-2024
12 June 2024

Encryptor Shop

After realizing how insecure the systems of many companies are (they're always getting hacked), I decided to start offering Encryption...

BCA-CTF-2024, crypto, crypto/rsa, crypto/gcd
BCA-CTF-2024
12 June 2024

Rad Be Damned

My friend seems to be communicating something but I can't make out anything. Why do we live so close to...

BCA-CTF-2024, crypto, crypto/error-checking
BCA-CTF-2024
12 June 2024

Rsa Encrypter

I made an rsa encrypter to send my messages but it seems to be inconsistent... `nc challs.bcactf.com 31452` [rsa_encrypter.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/BCA-CTF-2024/rsa_encrypter.py) ---...

BCA-CTF-2024, crypto, crypto/rsa, crypto/hastad-broadcast-attack
BCA-CTF-2024
12 June 2024

Superstitious 2

My client is a bit picky with the primes they are willing to use... (Sequel from BCACTF 4.0) [superstitious-2.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/BCA-CTF-2024/superstitious-2.py) [superstitious-2.txt](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/BCA-CTF-2024/superstitious-2.txt)...

BCA-CTF-2024, crypto, crypto/rsa, crypto/branch-and-prune
BCA-CTF-2024
12 June 2024

Talk To Echo

Echo is lonely and would like to talk `nc challs.bcactf.com 31755` [echo.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/BCA-CTF-2024/echo.py) --- Here's the source code: ```py from random...

BCA-CTF-2024, crypto, crypto/ecc, crypto/invalid-curve-attack
BCA-CTF-2024
12 June 2024

Time Skip

One of our problem writers got sent back in time! We found a piece a very very old piece of...

BCA-CTF-2024, crypto, crypto/scytale
BCA-CTF-2024
12 June 2024

Vinegar Times 3

We can't speak French and just say what we see. We also don't know what underscores are add them yourself....

BCA-CTF-2024, crypto, crypto/vigenere
BCA-CTF-2024
12 June 2024

BCA CTF 2024

[](https://ctftime.org/event/2274) Placement: #5/823 overall, #2/139 high school --- ## Thoughts: More prize money for reCAPTCHA the Flag! Dedicated a lot...

BCA-CTF-2024
UIUCTF-2024
02 July 2024

Determined

"It is my experience that proofs involving matrices can be shortened by 50% if one throws the matrices out." Emil...

UIUCTF-2024, crypto, crypto/rsa, crypto/gcd
UIUCTF-2024
02 July 2024

Groups

My friend told me that cryptography is unbreakable if moduli are Carmichael numbers instead of primes. I decided to use...

UIUCTF-2024, crypto, crypto/carmichael, crypto/dlp
UIUCTF-2024
02 July 2024

Naptime

I'm pretty tired. Don't leak my flag while I'm asleep. [pub.txt](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/UIUCTF-2024/nap-pub.txt) [enc_dist.sage](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/UIUCTF-2024/nap-enc_dist.sage) --- Here's the source Sage file: ```py from...

UIUCTF-2024, crypto, crypto/knapsack, crypto/merkle-hellman, crypto/byte-by-byte
UIUCTF-2024
02 July 2024

Snore Signatures

These signatures are a bore! `ncat --ssl snore-signatures.chal.uiuc.tf 1337` [chal.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/UIUCTF-2024/snore-chal.py) --- Here's the Python source: ```py #!/usr/bin/env python3 from Crypto.Util.number...

UIUCTF-2024, crypto, crypto/schnorr-signature, crypto/forgery
UIUCTF-2024
02 July 2024

Without A Trace

Gone with the wind, can you find my flag? `ncat --ssl without-a-trace.chal.uiuc.tf 1337` [server.py](https://github.com/Nightxade/ctf-writeups/tree/master/assets/CTFs/UIUCTF-2024/trace-server.py) --- Here's the Python source: ```py...

UIUCTF-2024, crypto
UIUCTF-2024
02 July 2024

UIUCTF 2024

[](https://ctftime.org/event/2275) Placement: #80/959 --- ## Thoughts: i need a good nap after crypto/naptime. sleep-deprivation levels at an all-time high. In...

UIUCTF-2024
Backdoor-CTF-2024
24 December 2024

Mcdonalds

My friend has created his own hashing service and has given it to me to crack it, can you help...

Backdoor-CTF-2024, crypto, crypto/hash, crypto/mac
Backdoor-CTF-2024
24 December 2024

Cursed Credential

I forgot my Browser's saved password although a friend of mine tells that I can find it if I know...

Backdoor-CTF-2024, forensics, forensics/password-cracking, forensics/hashcat, forensics/rockyou
Backdoor-CTF-2024
24 December 2024

Backdoor CTF 2024

[](https://ctftime.org/event/2540) Placement: #38/476 --- ## Thoughts: First writeups in a while! Been pretty inactive individually and as a team for...

Backdoor-CTF-2024
Backdoor-CTF-2024
24 December 2024

Decompressor

Can you decompress the flag without the codes? nc 34.42.147.172 8009 Author : ph03n1x [chall.py](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Backdoor-CTF-2024/chall.py) --- Here's `chall.py`: ```py #!/usr/bin/env...

Backdoor-CTF-2024, misc, misc/compression, misc/huffman-coding
UofT-CTF-2025
12 January 2025

UofT CTF 2025

[](https://ctftime.org/event/2570) Placement: #50/897 --- ## Thoughts: Crypto was too hard :( Pwn went really well though! Solved 4/6, definitely could've...

UofT-CTF-2025
UofT-CTF-2025
12 January 2025

Baby Pwn 2

Here's a baby pwn challenge for you to try out. Can you get the flag? nc 34.162.142.123 5000 Author: atom...

UofT-CTF-2025, pwn, pwn/buffer-overflow, pwn/ret2win
UofT-CTF-2025
12 January 2025

Baby Pwn

Here's a baby pwn challenge for you to try out. Can you get the flag? nc 34.162.142.123 5000 Author: atom...

UofT-CTF-2025, pwn, pwn/buffer-overflow, pwn/ret2win
UofT-CTF-2025
12 January 2025

Counting Sort

Did you know that the best time complexity for a sorting algorithm is O(n). This is an example service that...

UofT-CTF-2025, pwn, pwn/out-of-bounds, pwn/write-what-where
UofT-CTF-2025
12 January 2025

Echo

Yet another echo service. However, the service keeps printing stack smashing detected for some reason, can you help me figure...

UofT-CTF-2025, pwn, pwn/buffer-overflow, pwn/format-string, pwn/got-overwrite