2024weight 20.95Codeby Games

Cybercoliseum Ⅲ

4 challenges with 4 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

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

Old version
1 writeup
Same technique in picoCTF: Permissions, Specialer, Codebook
Omniscient
1 writeup
Same technique in picoCTF: Permissions, Specialer, Codebook

Cryptography1

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

Crypto - Hills
1 writeup
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC

Forensics1

Recover something from a file, a capture, or a disk image - often from a part of it the format says is unused.

Solve it with:File type identifier by magic bytes Magic byte and file signature table PCAP analyzer for CTF network forensics EXIF metadata viewer Learn: File forensics and carving Learn: Network forensics

Neural network
1 writeup
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions

Misc2

Old version

Omniscient

Cryptography1

Crypto - Hills

Forensics1

Neural network

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