The difference between SSL and TLS

Dear experts,

I need to know the difference between SSL & TLS and in what situations I should I have to use them.

Thank you

Labib Makar

Labib,

At the 10 000 foot level version 3.0 has been replaced by. v1.0.

TLSv1.0 (RFC 4346) has been upgraded to SSL v3.0 (but they don't interact)

This "document of Cisco.com" describes the operation of both in detail: SSL: Foundation for the security of the Web

She States as some fundamental differences:

...

TLS uses slightly different cryptographic algorithms for such things as the generation of MAC of the secret keys features. TLS also includes more alert codes.

...

Also see: Wikipedia TLS

Regarding which one to use, depends on if the two parties (client/server) supports each one?  TLS v1.0 or v1.1 is more recent.

Most of the modern browsers tend to support them both.

i.e.

  • Firefox 3.5.7 supported both SSL and TLS v1.0 v3.0
  • Internet Explorer v6 supported two SSLv2, SSLv3, TLS v1.0
  • etc.

Hope that helps.

Steve Ochmanski

Tags: Cisco Security

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