IETF has formally deprecated the TLS 1.0 and TLS 1.1 cryptographic protocols because they lack support for recommended cryptographic algorithms and mechanisms
The Internet Engineering Task Force (IETF) formally deprecates Transport Layer Security (TLS) versions 1.0 (RFC 2246) and 1.1 (RFC 4346). Both versions lack support for current and recommended cryptographic algorithms and mechanisms. TLS version 1.2 was recommended for IETF protocols in 2008 and became obsolete with the introduction of TLS version 1.3 in 2018.
The TLS protocol was designed to allow client/server applications to communicate over the Internet in a secure way preventing message forgery, eavesdropping, and tampering.
The move to deprecate old versions aims at making products using them more secure.
The IETF now only recommends the use of the two latest versions TLS 1.2 and TLS 1.3.
Experts pointed out that older versions of the protocol were using cryptographic algorithms that were hit by multiple attacks over the years, including as BEAST, LUCKY 13, POODLE, and ROBOT.
Recently the US National Security Agency (NSA) published a guide urging organizations on eliminating obsolete Transport Layer Security (TLS) protocol configurations.
However, the number of organizations that are still using the deprecated versions of the protocol is still high.
