Build a VPN Tunnel
Build a WireGuard-style VPN: TUN/TAP virtual interfaces, Noise protocol handshake, X25519 + ChaCha20-Poly1305 + BLAKE2s, key schedule with forward secrecy, NAT traversal, cryptographic routing, and the protocol behind Tailscale and modern remote-access infrastructure.
advanced10 lessons4 chapters10 graded exercisesPython
No sign-up needed for lesson 1 · certificate on completion · sign up to save progress
What you’ll have built
Chapter by chapter. Every step is a graded exercise.
- VPN Fundamentals
- Cryptography & Handshake
- Tunneling & Routing
- Production
Starts in Python — solve in the language you choose in the editor, same tests either way.
Curriculum
4 chapters, 10 lessons. Each lesson is a short read, one graded exercise, and a quiz.
- 1What VPNs SolveRead · exercise · quiz
- 2TUN/TAP InterfacesRead · exercise · quiz
- 3Tunnel EncapsulationRead · exercise · quiz
Loading reference solution…