2024from public repositories

AIS3 Pre exam CTF Topic 2024

12 challenges with 16 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 live

Web3

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 verifier JWT alg=none bypass generator Web attack payload catalog JWT secret brute force Learn: Sessions, tokens and access control

It's MyGO!!!!! (CHW exploit)
2 official solutions
Also written up in: Chw41/My-CTF-Challenges, Chw41/My-CTF-Challenges
Axios.Min
1 official solution
Also written up in: Chw41/My-CTF-Challenges
Tocas
1 official solution
Also written up in: Chw41/My-CTF-Challenges

Misc2

Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.

Solve it with:Brainfuck and esolang decoder Cipher identifier and automatic decoder Regex tester with match offsets and capture groups Learn: Recognising encodings

App
2 official solutions
Also written up in: Chw41/My-CTF-Challenges, Chw41/My-CTF-Challenges
Server
1 official solution
Also written up in: Chw41/My-CTF-Challenges

Cryptography2

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 decoder Vigenere cipher solver with automatic key recovery RSA decryption and attack runner Wiener’s attack on small RSA private exponents In-browser hash cracker with rule transforms Learn: Classical ciphers and frequency analysis Learn: RSA and the parameters that break it