!!! Overview
[{$pagename}] typically describes an [Authentication Method] which uses a [request-Response] [messaging pattern].

[{$pagename}] is a family of [protocols] in which one party presents a question ("challenge") and another party must provide a valid answer ("[response]") to be [authenticated].[1]

The simplest example of a [{$pagename}] [protocol] is [password|password-based] [authentication], where the challenge is asking for the [password] and the valid response is the correct password.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Challenge-response authentication|Wikipedia:Challenge–response_authentication/|target='_blank'] - based on information obtained 2016-06-05-