2026from public repositories

Global Ynov Partners CTF 2026

6 challenges with 6 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

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

Faulty Machine
1 official solution
Also written up in: sreeisme/my-ctf-writeups
Me Is Mey
1 official solution
Also written up in: sreeisme/my-ctf-writeups

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 blobs WebAssembly disassembler Java .class disassembler Python .pyc bytecode disassembler Learn: Binary exploitation

Threekeys
1 official solution
Also written up in: sreeisme/my-ctf-writeups
Uncoding
1 official solution
Also written up in: sreeisme/my-ctf-writeups

Uncategorised1

The upstream scoreboard did not say, so neither do we.

Solve it with:Cipher identifier and automatic decoder Learn: Recognising encodings

Axiom
1 official solution
Also written up in: sreeisme/my-ctf-writeups

Binary exploitation1

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 finder Shellcode assembler and library Cyclic pattern generator and offset finder Format string exploit builder Learn: Binary exploitation

Riddle
1 official solution
Also written up in: sreeisme/my-ctf-writeups

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