SIP - The Session Initiation Protocol (RFC 3261)
How SIP (RFC 3261) sets up, modifies, and tears down multimedia sessions using a text request/response model, its elements, layered design, transactions, dialogs, and security.
2026, Jul 20 —- Posts
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The IPsec and IKE Document Roadmap (RFC 6071)
A guided tour of RFC 6071, the roadmap that maps the sprawling IPsec and IKE RFC landscape - the seven document groups, IPsec-v2 vs v3, IKEv1 vs IKEv2, extensions, and crypto requirement levels.
2026, Jul 20 —HOTP - An HMAC-Based One-Time Password Algorithm (RFC 4226)
How HOTP (RFC 4226) turns a shared secret and a counter into a 6-digit one-time password using HMAC-SHA-1 and dynamic truncation, with its security analysis, validation rules, and link to TOTP.
2026, Jul 20 —