Transport Layer Security
Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptography protocols designed to provide communications security over a computer network.They use X.509 certificates and hence asymmetric cryptography to authenticate the counter party with whom they are communicating, and to negotiate a symmetric key. This session key is then used to encrypt data flowing between the parties. This allows for data/message confidentiality, and message authentication codes for message integrity and as a by-product, message authentication. Several versions of the protocols are in widespread use in applications such as web browsing, electronic mail, Internet faxing, instant messaging, and voice-over-IP (VoIP). An important property in this context is forward secrecy, so the short-term session key cannot be derived from the long-term asymmetric secret key.
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