2021from public repositories
ACSC 2021
14 challenges with 17 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 liveUncategorised13
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2 official solutionsHistogram
2 official solutionsRsa Stream
2 official solutionsApi Original
1 official solutionBaby Developer Original
1 official solutionCarot
1 official solutionCowsay As A Service Original
1 official solutionEncoder
1 official solutionFavorite Emojis Original
1 official solutionPickle Rick
1 official solutionSugar
1 official solution
Cryptography1
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
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1 official solution