124).Transport Layer Security (TLS)

Transport Layer Security (TLS)- its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide security for communications over networks such as the Internet. TLS and SSL encrypt the segments of network connections at the Transport Layer end-to-end.
http://www.google.com/search?hl=en&q=define:Transport+Layer+Security+(TLS)&btnG=Search