2018no writeups on CTFtime
HSCTF 5
10 challenges with 10 published solutions between them. CTFtime lists this event but has no writeups filed against it, so it is absent from the index CTFtime feeds. These were found in public repositories instead. Each link is pinned to the commit it was read from.
The event on CTFtimeUncategorised6
The upstream scoreboard did not say, so neither do we.
Alarm
1 official solutionCaesar
1 official solutionJumper
1 official solutionOK 250
1 official solutionReview
1 official solutionTiles
1 official solution
Cryptography4
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 solutionMaster Keys 200
1 official solutionStolen Sheets 250
1 official solutionVery Small Primes 200
1 official solution