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TLS 1.0 (deprecated) TLS 1.1 (deprecated) TLS 1.2 TLS 1.3 EV certificate SHA-2 certificate ECDSA certificate BEAST CRIME POODLE (SSLv3) RC4 FREAK Logjam Protocol selection by user Microsoft Edge (Chromium-based) OS-independent: 79–83 Windows (10+) macOS (11+) Linux Android (8.0+) iOS (16+) No No Yes Yes Yes Yes Yes Yes Yes Mitigated Not affected
The publishing of TLS 1.3 and DTLS 1.3 obsoleted TLS 1.2 and DTLS 1.2. Note that there are known vulnerabilities in SSL 2.0 and SSL 3.0. In 2021, IETF published RFC 8996 also forbidding negotiation of TLS 1.0, TLS 1.1, and DTLS 1.0 due to known vulnerabilities. NIST SP 800-52 requires support of TLS 1.3 by January 2024.
TLS 1.3 support was subsequently added — but due to compatibility issues for a small number of users, not automatically enabled [50] — to Firefox 52.0, which was released in March 2017. TLS 1.3 was enabled by default in May 2018 with the release of Firefox 60.0. [51] Google Chrome set TLS 1.3 as the default version for a short time in 2017.
But with the adoption of TLS 1.3, only 5 cipher suites have been officially supported and defined. [2] The structure and use of the cipher suite concept are defined in the TLS standard document. [3] TLS 1.2 is the most prevalent version of TLS. The newest version of TLS (TLS 1.3) includes additional requirements to cipher suites.
Since Windows Server 2012, it is enabled by default in Windows Server versions, because Data Center Transmission Control Protocol (DCTCP) is used. [12] In previous Windows versions and non-server versions it is disabled by default. ECN support can be enabled using a shell command such as netsh interface tcp set global ecncapability=enabled.
Opportunistic TLS (Transport Layer Security) refers to extensions in plain text communication protocols, which offer a way to upgrade a plain text connection to an encrypted (TLS or SSL) connection instead of using a separate port for encrypted communication.
HTTP/2 is defined both for HTTP URIs (i.e. without TLS encryption, a configuration which is abbreviated in h2c) and for HTTPS URIs (over TLS using ALPN extension [45] where TLS 1.2 or newer is required, a configuration which is abbreviated in h2).
Under TLS 1.2 only one stapled response can be sent by a server, the OCSP response associated with the end-certificate. Under TLS 1.3 a server can send multiple OCSP responses, typically one for each certificate in the certificate chain.