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Transport Layer Security

See TLS.



TLS

(1) See transparent LAN service.

(2) (Transport Layer Security) A security protocol from the IETF that is based on and supersedes Secure Sockets Layer 3.0 (SSL 3.0). Very similar to SSL, TLS uses digital certificates to authenticate the user as well as authenticate the network (in a wireless network, the user could be logging into a rogue access point). TLS adopted a more secure message authentication code (see HMAC) and added new alert messages.

HTTPS and Port Number 465
A TLS session starts by sending a request to the Web server with an HTTPS prefix in the URL, which inserts TLS port number 465 into the packets. See well-known port.

The TLS client uses the public key to encrypt a random number and send it back to the server. The random number, combined with additional random numbers previously sent to each other, is used to generate a secret session key to encrypt the subsequent message exchange. See digital certificate and EAP.




The Handshake
These steps take place to negotiate a TSL (or SSL) session before any user data are transmitted. The algorithm mentioned is the encryption method. The checksums in steps 5 and 6 ensure that the message was not tampered with (see MAC).






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