!!! Overview
[{$pagename}] is a process of number messages that are sent.

[{$pagename}] are a vital [Cryptographic Primitive] for several uses:
* provide a source for [Initialization Vectors] for the [Encryption] [algorithm]
* they allow [Bob] to reject replayed messages without the necessity of keeping a large database
* they tell [Bob] which messages were lost in transit
* they ensure that [Bob] receives the messages in their correct order. 
For these reasons, the message numbers must increase monotonically (i.e., later messages have larger message numbers) and must be unique. 

!! More Information
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