Cryptopals Crypto Challenges
The Cryptopals Crypto Challenges offer a series of exercises demonstrating attacks on real-world cryptography, covering various topics from basics to abstract algebra, providing an interactive way to learn about cryptographic concepts and vulnerabilities.
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Free and open-source cybersecurity training classes with multi-class learning paths for high-skill, high-pay job skills.
A live archive of DEF CON CTF challenges, vulnerable by design, for hackers to play safely.
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