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SSLv3 has now joined its older brother in being banished by RFC 7568.
All references to SSL below are retained for reasons of common usage (the term is still more frequently used than TLS) but should be simultaneously translated by the reader into TLS.
While there are detail differences between SSL and TLS the following descriptions apply to both protocols.
Note: SSLv2 was banned by RFC 6176 which contains a dire list of its shortcomings.
In the case of HTTPS the well-known port number is 443, in the case of IMAPS - port 993, POP3S - port 995 etc..
We've also added some info on the contents of various file types (.pem, .p12, .pfx, .der, .cer), PEM keywords and a PKCS to RFC mapping list.
Nevertheless, we persist in our ingrained habit for no particularly good reason (old dog..tricks..).
Note: If you want/need/desire more options over RFC formats then you now have a veritable cornucopia of choice.
When a secure connection is initially established it will, depending on the implementation, negotiate support of the particular protocol from the set SSLv3, TLSv1, TLSv1.1 or TLSv1.2.
Such is the pervasive power of the name SSL that in most cases what is called SSL is most likely using TLS - for instance Open SSL supports both SSL (v3) and TLS (TLSv1, TLSv1.1 and TLSv1.2) protocols.