The two oldest versions SSL 2 and SSL 3 have not been considered secure for a very long time and are no longer used by websites or web browsers. The next three versions, known as TLS 1.0 and TLS 1.1 and TLS 1.2 are the topic at hand. There is an even newer version, TLS 1.3, but it is still in draft status and hardly used anywhere.
http://www.computerworld.com/article/3208077/internet/tweaking-internet-explorer-to-only-use-tls-1-2.html
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