Challenges

Category Web Pwn Reverse Crypto Forensics Misc OSINT Stego Blockchain Hardware Mobile

Difficulty Beginner Easy Medium Hard Insane

CTFtime weight

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Higher weight ≈ harder, more prestigious event.

Year

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CTF

Country

Must have Source / Docker Writeup

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Challenge	CTF	Weight	Category	Has
Cryptoclock #known-plaintext-xor	NahamCon 2025	53.77	Crypto	files wu 1
one-more-time-pad #known-plaintext-xor	LA 2023	–	Crypto	files wu 2
XOR #known-plaintext-xor	OFPPT 2022	–	Crypto	files wu 2