2018from public repositories
tasks ais3Final 2018
9 challenges with 23 published solutions between them. The writeups for this event were found in public repositories. Each link is pinned to the commit it was read from.
Where these writeups liveCryptography6
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
200 secureSub
4 official solutionsAlso written up in: sasdf/ctf, sasdf/ctf, sasdf/ctf, sasdf/ctf
300 Xorlnarmoni'Akda
4 official solutionsAlso written up in: sasdf/ctf, sasdf/ctf, sasdf/ctf, sasdf/ctf
100 Mama
2 official solutionsAlso written up in: sasdf/ctf
Plaintext
1 official solutionAlso written up in: sasdf/ctf
Reverse engineering3
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
Solve it with:Strings extractor for binaries and blobsWebAssembly disassemblerJava .class disassemblerPython .pyc bytecode disassemblerLearn: Binary exploitation
200 AlmightyDuctTape
5 official solutionsAlso written up in: sasdf/ctf, sasdf/ctf, sasdf/ctf, sasdf/ctf, sasdf/ctf
100 SecDES
2 official solutionsScramble
1 official solutionAlso written up in: sasdf/ctf