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Cryptography learning through interactive puzzles and challenges

Use cryptographic libraries and command-line tools to work with TLS, certificates, and related standards.

Programming exercises that expose cryptographic weaknesses

Encrypt files or streams with explicit recipients and a small command-line interface.

Encrypted IPv6 overlay with public-key-derived addressing

Large Quantitative Models that use physics, chemistry, and scientific data to produce quantitative results.

Security wargames with a suggested learning order.

Bitcoin network swaps with claim and refund workflows