BCA CTF 2024

Placement: #5/823 overall, #2/139 high school

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Thoughts:

More prize money for reCAPTCHA the Flag! Dedicated a lot of time to this CTF, and managed to full solve crypto and solve a lot of challenges in other categories (except web lmao). Had a lot of fun with this CTF :)

Writeups

• Cha Cha Slide
  [100] <BCA-CTF-2024/> <crypto/> <crypto/chacha20/>
• Cinnamon Dynamics
  [175] <BCA-CTF-2024/> <crypto/> <crypto/sha256/> <crypto/length-extension-attack/>
• Encryptor Shop
  [50] <BCA-CTF-2024/> <crypto/> <crypto/rsa/> <crypto/gcd/>
• Rad Be Damned
  [150] <BCA-CTF-2024/> <crypto/> <crypto/error-checking/>
• Rsa Encrypter
  [100] <BCA-CTF-2024/> <crypto/> <crypto/rsa/> <crypto/hastad-broadcast-attack/>
• Superstitious 2
  [150] <BCA-CTF-2024/> <crypto/> <crypto/rsa/> <crypto/branch-and-prune/>
• Talk To Echo
  [175] <BCA-CTF-2024/> <crypto/> <crypto/ecc/> <crypto/invalid-curve-attack/>
• Time Skip
  [50] <BCA-CTF-2024/> <crypto/> <crypto/scytale/>
• Vinegar Times 3
  [25] <BCA-CTF-2024/> <crypto/> <crypto/vigenere/>