Editing Transport Layer Security (section)

===TLS 1.1===
TLS 1.1 was defined in RFC 4346 in April 2006.{{Ref RFC|4346}} It is an update from TLS version 1.0. Significant differences in this version include:
*Added protection against [[Block cipher mode of operation#Cipher Block Chaining (CBC)|cipher-block chaining]] (CBC) attacks.
**The implicit [[initialization vector]] (IV) was replaced with an explicit IV.
**Change in handling of [[Block cipher mode of operation#Padding|padding errors]].
*Support for [[Internet Assigned Numbers Authority|IANA]] registration of parameters.<ref name="urlnvlpubs.nist.gov">{{Cite web |title=Transport Layer Security Parameters – Cipher Suites |url=https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4 |access-date=2022-12-16 |website=Internet Assigned Numbers Authority (IANA) |archive-date=2016-12-21 |archive-url=https://web.archive.org/web/20161221223613/http://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4 |url-status=live }}</ref>
Support for TLS versions 1.0 and 1.1 was widely deprecated by web sites around 2020,<ref>{{cite web|last1=Mackie|first1=Kurt|title=Microsoft Delays End of Support for TLS 1.0 and 1.1 -|url=https://mcpmag.com/articles/2020/04/02/microsoft-tls-1-0-and-1-1.aspx|website=Microsoft Certified Professional Magazine Online|access-date=2021-06-14|archive-date=2021-06-14|archive-url=https://web.archive.org/web/20210614004948/https://mcpmag.com/articles/2020/04/02/microsoft-tls-1-0-and-1-1.aspx|url-status=live}}</ref> disabling access to [[Firefox]] versions before 24 and [[Chromium (web browser)|Chromium-based browsers]] before 29,<ref>{{Cite web|url=https://answers.psionline.com/knowledgebase/tls-1-2-faq|title=TLS 1.2 FAQ – Knowledge Base|website=Answers.psionline.com|access-date=20 February 2022|archive-date=20 February 2022|archive-url=https://web.archive.org/web/20220220051112/https://answers.psionline.com/knowledgebase/tls-1-2-faq/|url-status=dead}}</ref> though third-party fixes can be applied to Netscape Navigator and older versions of Firefox to add TLS 1.2 support.<ref>{{cite web|title=Using Netscape 9 in 2022|url=https://msfn.org/board/topic/183515-using-netscape-9-in-2022|website=MSFN|access-date=2025-04-24|archive-date=2025-04-18|archive-url=https://web.archive.org/web/20250418030114/https://msfn.org/board/topic/183515-using-netscape-9-in-2022/|url-status=live}}</ref>