!!! nonce
[{$pagename}] ("number used once") is, typically a randomly generated value (technically does not need to be a number) that's associated with a [message] in a [cryptographic] scheme and must be unique within some specified scope (such as a given time interval, or a session).[1]

[{$pagename}] typically used to prevent [Replay attack].

For example, challenges used in challenge-response [authentication] [protocols] generally must not be repeated until [authentication] keys are changed, or there is a possibility of a [Replay attack]. 

Using a [{$pagename}] as a challenge is a different requirement than a [random] challenge, because a [{$pagename}] may be predictable.


[{$pagename}] may be used for an [Initialization Vector] it [MUST] only to be non-repeating and the required randomness is derived internally.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [What is the difference between hash salting and noncing?|https://stackoverflow.com/a/8176717/88122|target='_blank'] - based on information obtained 2016-10-28