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Cloudflare for Developers: What It's Great At, Where It Bites, and How to Actually Use It

Cloudflare is best understood not as "a CDN" but as a programmable network that sits between your users and your origin, plus a growing platform for running code and storing data at the edge.

  • Cloudflare offers free TLS, CDN, DNS, and serverless runtime for developers
  • Workers runtime lacks Node.js support and has CPU time limits
  • Cloudflare's generous free tier simplifies site setup with minimal configuration

Ed25519 vs ECDSA: Why the Nonce Decides Everything

ECDSA and Ed25519 both sign data with elliptic curves, and both produce a 64-byte signature that verifies in a fraction of a millisecond.

  • ECDSA and Ed25519 use elliptic curves for data signing with 64-byte signatures.
  • Ed25519 automatically computes unique nonce, unlike ECDSA's random k per signature.
  • Sony's PS3 and Android's SecureRandom failures highlight nonce's critical role in ECDSA security.

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