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An authentication and security protocol that is widely implemented in browsers and web servers. TLS is defined by RFC 5246 and RFC 8446. TLS is similar to the older Secure Sockets Layer (SSL) protocol, and TLS 1.0 is effectively SSL version 3.1. [NIST SP 800-52] specifies how TLS is to be used in government applications.
NIST SP 800-57 Part 2 Rev.1