Cryptography Isn't Scary
summary
Crash course shows hands-on primitives and working code: Diffie‑Hellman via x25519 produces a shared secret used with AES‑128, Node uses crypto/OpenSSL keypair APIs to derive the secret, browsers expose getRandomValues and the SubtleCrypto ops for sign/verify/encrypt, and a demo produces identical ciphertexts in Node. The RSA/NIST/NSA dual‑EC RNG story explains a plausible backdoor. The Sigstore effort and Sigstore JS plus OIDC/GitHub Actions enable RFC 626 style keyless package signing to link npm packages to source and CI.
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chapters (8)
- 0:00Introduction and basics
- 3:01Core cryptographic concepts
- 5:35Modular arithmetic explained
- 7:09Elliptic curve cryptography
- 10:44Diffie-Hellman key exchange
- 12:50Crypto in Node and browsers
- 16:23The NSA backdoor story
- 20:21Software signing with Sigstore
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