2021from public repositories
Aspire CTF 2021
11 challenges with 11 published solutions between them. CTFtime has no listing for this event at all, so nothing built on CTFtime can show what it was made of. These writeups were found in public repositories instead. Each link is pinned to the commit it was read from.
Where these writeups liveCryptography11
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
Blocks
1 official solutionCoverImage
1 official solutionMatthew
1 official solutionOn Off
1 official solutionTouch
1 official solutionXOR A Solitary Byte
1 official solutionXOR OTP
1 official solutionXOR Repeater
1 official solution