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Explore

Five sections, one way of learning: read the idea, run it, then break it. Start anywhere.

Attacks

Watch common attacks play out step by step, then see what stops them.

15 lessons

Cryptography

Ciphers, hashes and key exchange, with tools you can run on your own input.

32 lessons

Scanning

How attackers and defenders map hosts, ports and services.

12 lessons

Practice labs

Run real network commands and security tools against your own machine.

9 lessons

Games

Short timed challenges that test what you learned.

5 lessons

Stuck, or want to compare notes? The forum is where questions and answers live.