Transport Layer Security (TLS)

A mechanism evolved from Secure Sockets Layer (SSL) for encrypting data communicated over a network to ensure no eavesdropping or tampering, used for web browsers, file transfers, VPN connections, instant messaging, and VoIP. TLS is composed of two layers: a record protocol, which provides a secure connection; and a handshake protocol, which allows the server and client to authenticate each other before exchanging any data.