Encrypt-then-MAC for Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)

This document describes a means of negotiating the use of the encrypt- then-MAC security mechanism in place of the existing MAC-then-encrypt mechanism in Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS). The MAC-then-encrypt mechanism has been the subject of a number of security vulnerabilities over a period of many years.