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
XOR_101 #xor #repeating-key	squ1rrel 2025	24.25	Crypto	files wu 1
X_Marked_the_Spot #xor #repeating-key	UIUCTF 2024	–	Crypto	files wu 2
Either_or_Neither_nor #xor #repeating-key #bruteforce	RITSEC 2023	–	Crypto	files wu 1