2020from public repositories
BambooFoxCTF 2020
6 challenges with 10 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 liveCryptography4
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
Also written up in: KinoVir/ctf-wps, KinoVir/ctf-wps, KinoVir/ctf-wps, KinoVir/ctf-wps, KinoVir/ctf-wps
2019 311
1 official solutionAlso written up in: KinoVir/ctf-wps
Also written up in: KinoVir/ctf-wps
Server
1 official solutionAlso written up in: KinoVir/ctf-wps
Reverse engineering2
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
Decompile
1 official solutionAlso written up in: KinoVir/ctf-wps
How2decompile[solved]
1 official solutionAlso written up in: KinoVir/ctf-wps