2019from the authors’ own sites
NACTF Group Test Randomizer 2019
1 challenge with 2 published solutions between them. The writeups for this event were found on the authors’ own sites.
Where these writeups liveCryptography1
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
Chals
2 official solutionsAlso written up in: jebidiah-anthony.github.io, jebidiah-anthony.github.io