Crypto CTF 2019
15 challenges with 26 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.
Full task list on CTFtimeCryptography8
Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- rsa-like
- crypto
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- prime
- crypto
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- factoring
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- fermat
- guessing
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- ecc
Same technique in picoCTF: Shared Secrets, StegoRSA, Timestamped Secrets
- polynomial
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
Misc7
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
- modular-arithmetic
Same technique in picoCTF: Permissions, Specialer, Codebook
- number_theory
Same technique in picoCTF: Permissions, Specialer, Codebook
- base64
- rotated
Same technique in picoCTF: Bases, repetitions, Permissions
- secret-sharing
Same technique in picoCTF: Permissions, Specialer, Codebook
- png
- xor
Same technique in picoCTF: Permissions, Specialer, Codebook
- linear_algebra
Same technique in picoCTF: Permissions, Specialer, Codebook
- programming
Same technique in picoCTF: Permissions, Specialer, Codebook