2024no writeups on CTFtime
BlueHens CTF 2024
12 challenges with 12 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 CTFtimeUncategorised4
The upstream scoreboard did not say, so neither do we.
Cbc Encrypted
1 official solutionCtr Mode Is Just Xor
1 official solutionRoman Xor
1 official solutionXor Without Xor
1 official solution
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
Simon Says
1 official solutionTo Rsa
1 official solution
Binary exploitation3
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
Solve it with:ROP gadget finderShellcode assembler and libraryCyclic pattern generator and offset finderFormat string exploit builderLearn: Binary exploitation
Pure Write What Where
1 official solutionRet2bf
1 official solutionTo Pwn
1 official solution
Web2
Reach data or functionality the application meant to keep from you - through its inputs, its tokens, or its trust in the client.
Solve it with:JWT decoder and signature verifierJWT alg=none bypass generatorWeb attack payload catalogJWT secret brute forceLearn: Web attacks and session tokens
Firefun 3
1 official solutionJust A Day At The Breach
1 official solution