2021from public repositories
TianYiBei 2021
7 challenges with 8 published solutions between them. The writeups for this event were found in public repositories. Each link is pinned to the commit it was read from.
Where these writeups liveCryptography7
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.
Solve it with:Cipher identifier and automatic decoderVigenere cipher solver with automatic key recoveryRSA decryption and attack runnerWiener’s attack on small RSA private exponentsIn-browser hash cracker with rule transformsLearn: Classical ciphers and frequency analysisLearn: RSA and the parameters that break it
RSA Matrix babypack
2 official solutionsAlso written up in: kokifish/CTF-detailed-writeups, kokifish/CTF-detailed-writeups
MyCipher
1 official solutionAlso written up in: kokifish/CTF-detailed-writeups
Official
1 official solutionAlso written up in: kokifish/CTF-detailed-writeups
Also written up in: kokifish/CTF-detailed-writeups
Task Server
1 official solutionAlso written up in: kokifish/CTF-detailed-writeups
TryHash
1 official solutionAlso written up in: kokifish/CTF-detailed-writeups
Also written up in: kokifish/CTF-detailed-writeups