Cipher Suites in TLS/SSL (Schannel SSP)

Cipher Suites in TLS/SSL (Schannel SSP)

A cipher suite is a set of cryptographic algorithms. The schannel SSP implementation of the TLS/SSL protocols use algorithms from a cipher suite to create keys and encrypt information. A cipher suite specifies one algorithm for each of the following tasks:

  • Key exchange
  • Bulk encryption
  • Message authentication

Key exchange algorithms protect information required to create shared keys. These algorithms are asymmetric (public key algorithms) and perform well for relatively small amounts of data.

Bulk encryption algorithms encrypt messages exchanged between clients and servers. These algorithms are symmetric and perform well for large amounts of data.

Message authentication algorithms generate message hashes and signatures that ensure the integrity of a message.

Developers specify these elements by using ALG_ID data types. For more information, see Specifying Schannel Ciphers and Cipher Strengths.

In earlier versions of Windows, TLS cipher suites and elliptical curves were configured by using a single string:

Aa374757.TLS-Cipher-Suite(en-us,VS.85).png

Different Windows versions support different TLS cipher suites and priority order. See the corresponding Windows version for the default order in which they are chosen by the Microsoft Schannel Provider.

Windows Server 2016 and Windows 10, version 1607:  For information about supported cipher suites, see TLS Cipher Suites in Windows 10 v1607

Windows 10, version 1511:  For information about supported cipher suites, see TLS Cipher Suites in Windows 10 v1511

Windows 10, version 1507:  For information about supported cipher suites, see TLS Cipher Suites in Windows 10 v1507

Windows Server 2012 R2 and Windows 8.1:  For information about supported cipher suites, see TLS Cipher Suites in Windows 8.1

Windows Server 2012 and Windows 8:  For information about supported cipher suites, see TLS Cipher Suites in Windows 8

Windows Server 2008 R2 and Windows 7:  For information about supported cipher suites, see TLS Cipher Suites in Windows 7

Windows Server 2008 and Windows Vista:  For information about supported cipher suites, see TLS Cipher Suites in Windows Vista

Windows Server 2003 and Windows XP:  For information about supported cipher suites, see the following topics.

TopicDescription

TLS Cipher Suites

Information about the cipher suites available with the TLS protocol in Windows Server 2003 and Windows XP.

Secure Sockets Layer Protocol

General information about SSL 2.0 and 3.0, including the available cipher suites in Windows Server 2003 and Windows XP.

 

Note  Prior to Windows 10, cipher suite strings were appended with the elliptic curve to determine the curve priority. Windows 10 supports an elliptic curve priority order setting so the elliptic curve suffix is not required and is overridden by the new elliptic curve priority order, when provided, to allow organizations to use group policy to configure different versions of Windows with the same cipher suites.
 

 

 

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