2022weight 23.54CyberErudites

GDG Algiers CTF 2022

9 challenges with 11 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.

Full task list on CTFtime

Misc5

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

POSTAL
50 pts2 writeups
- misc
Same technique in picoCTF: Permissions, Specialer, Codebook
Intruder
50 pts1 writeup
- misc
Same technique in picoCTF: Permissions, Specialer, Codebook
MLM
500 pts1 writeup
- misc
- ai
Same technique in picoCTF: Permissions, Specialer, Codebook
Red diamond
50 pts1 writeup
- jail
Same technique in picoCTF: Permissions, Specialer, Codebook
venomous
500 pts1 writeup
- jail
Same technique in picoCTF: Permissions, Specialer, Codebook

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 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