2018found by harvest
HSCTF 5
5 challenges with 5 published solutions between them. No writeups were ever filed against this event's listing, so its solutions were found in public repositories instead. Each link is pinned to the commit it was read from.
The event listingCryptography4
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
Blown Apart 350
1 official solutionAlso written up in: chiumax/CTF-Writeups
Master Keys 200
1 official solutionAlso written up in: chiumax/CTF-Writeups
Stolen Sheets 250
1 official solutionAlso written up in: chiumax/CTF-Writeups
Very Small Primes 200
1 official solutionAlso written up in: chiumax/CTF-Writeups
Uncategorised1
The upstream scoreboard did not say, so neither do we.
OK 250
1 official solutionAlso written up in: chiumax/CTF-Writeups