nonce

Because a nonce changes with time, it is easy to tell whether or not an attempt at replay or reproduction of a file is legitimate; the current time can be compared with the nonce. If it does not exceed it or if no nonce exists, then the attempt is authorized. Otherwise, the attempt is not authorized.

2) In general usage, a nonce is a pronounceable string of characters invented and used only in a given context. The origin of the term goes back to the Middle Ages with "the anes," an expression meaning "for the immediate occasion." This evolved to "the nonce," perhaps based on widespread mispronunciation.

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