Transport Layer Security (TLS)

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wikipedia:Transport Layer Security cryptographic protocol successor to SSL (deprecated since 2011).

Once the client and server have agreed to use TLS, they negotiate a stateful connection by using a handshaking procedure. The protocols use a handshake with an asymmetric cipher to establish not only cipher settings but also a session-specific shared key with which further communication is encrypted using a symmetric cipher.

macOS 10.15 (June 2019) and IOS 13 requirements (

  • TLS server certificates and issuing CAs using RSA keys must use key sizes greater than or equal to 2048 bits
  • SHA-2

SSL and TLS protocols
Protocol Published Status
SSL 1.0 Unpublished Unpublished
SSL 2.0 1995 Deprecated in 2011 (RFC 6176)
SSL 3.0 1996 Deprecated in 2015 (RFC 7568)
TLS 1.0 1999 Deprecation planned in 2020
TLS 1.1 2006 Deprecation planned in 2020
TLS 1.2 2008
TLS 1.3 2018


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