Build TLS 1.3
Build TLS 1.3 from scratch: AEAD ciphers, HKDF key schedule, ephemeral X25519 key exchange, the 1-RTT handshake, encrypted record layer, session resumption with PSK, and 0-RTT data. The protocol securing every HTTPS request on the modern internet.
advanced14 lessons4 chapters14 graded exercisesPython
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What you’ll have built
Chapter by chapter. Every step is a graded exercise.
- Cryptographic Primitives
- TLS 1.3 Handshake
- Record Layer & Resumption
- Production Concerns
Starts in Python — solve in the language you choose in the editor, same tests either way.
Curriculum
4 chapters, 14 lessons. Each lesson is a short read, one graded exercise, and a quiz.
- 1What TLS SolvesRead · exercise · quiz
- 2AEAD EncryptionRead · exercise · quiz
- 3HKDF — Key DerivationRead · exercise · quiz
- 4HKDF-Expand-Label & Derive-SecretRead · exercise · quiz
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