2025from public repositories
Cyberthon 2025
5 challenges with 6 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 liveCryptography5
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
Hashcryption
2 official solutionsAlso written up in: fwyr/ctf-writeups, fwyr/ctf-writeups
ByteRotator
1 official solutionAlso written up in: fwyr/ctf-writeups
Insider Knowledge
1 official solutionAlso written up in: fwyr/ctf-writeups
Pemcakes
1 official solutionAlso written up in: fwyr/ctf-writeups
Really Secure Algorithm
1 official solutionAlso written up in: fwyr/ctf-writeups