!!! Overview
[{$pagename}] is an [Internet Draft] which [Deprecated] [Transport Layer Security] ([TLS 1.0]) [versions] 1.0 [RFC 2246] and [TLS 1.1] [RFC 4346] were superseded by [TLS 1.2] [RFC 5246] in [2008|Year 2008], which has now itself been superseded by [TLS 1.3] [RFC 8446] in August [2018|Year 2018]


It is therefore timely to further deprecate these old [versions].

Technical reasons for deprecating these versions include:
* They require [implementation] of older [Cipher Suites] that are no longer desirable for [cryptographic] reasons, e.g.  [TLS 1.0] makes TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA mandatory to implement
* Lack of support for current recommended cipher suites, especially using [AEAD] [ciphers] which are not supported prior to [TLS 1.2]. 
** Note: [IANA Registry] entries for no-longer-desirable [Cipher Suites] remain in the [registries|IANA Registry], but many [TLS] registries are being updated through [RFC 8447] which denotes such entries as "[NOT RECOMMENDED]."
* Integrity of the handshake depends on [SHA-1] [hash]
* Authentication of the peers depends on [SHA-1] [Digital Signatures]
* Support for four [protocol] [versions] increases the likelihood of misconfiguration
* At least one widely-used library has plans to drop TLSv1.1 and TLSv1.0 support in upcoming releases; products using such libraries would need to use older versions of the libraries to support TLSv1.0 and TLSv1.1, which is clearly undesirable

!! [Browsers] and [{$pagename}]
[Google]'s [Chrome], [Mozilla]'s [Firefox], [Microsoft]'s [Edge] and [Internet Explorer] 11, and [Apple]’s [Safari] [browser] are all due to revoke support for [TLS 1.0] and [TLS 1.1] by March 31, [2020|Year 2020].

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Deprecating TLSv1.0 and TLSv1.1|https://tools.ietf.org/html/draft-ietf-tls-oldversions-deprecate-06|target='_blank'] - based on information obtained 2020-01-12