Ctf

Platform TJCTF 2026 (Thomas Jefferson CTF) Difficulty Easy → Hard OS Mixed: Linux, macOS ARM64, WebAssembly, Network captures Tags JWT crafting, SSRF via URL normalization, Zip Slip, RSA parity oracle, ECDSA timing/Minerva, invalid-curve attacks, Chebyshev matrix exponentiation, ReDoS as side channel, pickle exploitation, PCK parsing, polyglot files, RTP LSB steganography TJCTF 2026 was the kind of multi-day event that rewards breadth — twenty-one challenges spread across web, reverse engineering, cryptography, forensics, and misc, with no single technique cracking more than two boxes. This writeup is the consolidated solve log: one paragraph of prompt + trick + solution per challenge, the actual flag, and the moments worth quoting verbatim. ...

Crypto categories in CTFs intimidate more newcomers than any other. The barrier isn’t math — it’s pattern recognition. Almost every CTF crypto challenge is a known weakness applied to slightly different parameters. The First Pass — Identify the Family When a challenge drops, classify it in under 30 seconds: ...