This is the home page for the TLS WG; it's maintained IETF TLS Working Group.
The TLS protocols allows client/server applications to communicate over the Internet in a way that is designed to prevent eavesdropping, tampering, and message forgery. TLS is the connection-oriented verions and DTLS is the connectionless-oriented variant; (D)TLS is used to refer to both protocols.
TLS has been revised a number of times, but the current specifications are:
We track known implementations of TLS and DTLS 1.3 on our wiki.