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0xTo/ctf-Hacker-Resources
A large pile of CTF and hacking resources by topic.
A GitHub repository whose README lists topics such as CTFs and wargames, cryptography, forensics, Linux hacking, memory exploits, reverse engineering and network/802.11. It appears to mirror the 'Gray Hacker Resources' collection. Sprawling rather than curated.
Why it's useful
Topic-by-topic starting points for CTF prep.