!!! Overview
[{$pagename}] (also referred to by [Microsoft] as [Secure Channel] or [Schannel]) is a [Security Support Provider] ([SSP]) as used in the [Microsoft Windows] through the [Security Support Provider Interface] that provide identity [authentication] and [Secure connections], [private] [communication] through [encryption][{$pagename}] is used for access to web-enabled services, such as mail or personal information served on Web pages and secure [Netlogon Remote Protocol]

[{$pagename}], which includes a suite of four [authentication] [protocols], uses [Public Key] [certificates] to [authenticate] parties. When authenticating parties, [{$pagename}] selects one of the four [protocols] in the following order of preference:
* [Transport Layer Security] ([TLS]).
* [Secure Socket Layer] ([SSL]) version 3.0.
* [Private Communications Technology] ([PCT]) which is disabled by default in [Windows Server 2003].
* [SSLv2] version 2.0.

The [protocol] that is selected is the preferred [authentication] [protocol] that both parties can support. For example, if a server supports all four [Schannel] [protocols] and the client supports only [SSL 3.0|SSLv3] and [SSL 2.0|SSLv2], the [{$pagename}] will use [SSL 3.0|SSLv3].

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [TLS/SSL overview (Schannel SSP)|https://docs.microsoft.com/en-us/windows-server/security/tls/tls-ssl-schannel-ssp-overview|target='_blank'] - based on information obtained 2019-04-08