2019from public repositories
NCL Fall 2019
18 challenges with 38 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 liveUncategorised15
The upstream scoreboard did not say, so neither do we.
Cracking1(Easy)
4 official solutionsAccessLog(Easy)
2 official solutionsCatstagram(Medium)
2 official solutionsCracking2(Easy)
2 official solutionsCracking2(Medium)
2 official solutionsCracking3(Hard)
2 official solutionsCracking4(Hard)
2 official solutionsError
2 official solutionsErrorLog(Medium)
2 official solutionsHelper(Hard)
2 official solutionsIntegrity(Medium)
2 official solutionsPayPal(Hard)
2 official solutionsPoliceTimesheet(Easy)
2 official solutionsScriptKiddie(Medium)
2 official solutionsServiceScan(Easy)
2 official solutions
Cryptography3
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
Decoding5(Hard)
2 official solutionsStego2(Medium)
2 official solutionsStego3(Hard)
2 official solutions