WeChat Backend Team

Dec 9, 2016 · Information Security

Understanding TLS Record Protocol: Encryption, MAC, and Key Management

This article explains how the TLS record layer encrypts and authenticates application data by fragmenting, sequencing, optionally compressing, encrypting, computing HMAC, and transmitting over TCP/IP, while detailing the security parameters, key derivation, and the evolution from MAC‑then‑Encrypt to AEAD modes.