a random number that is only used once. It is generated at the beginning of a communication by one communication partner and has to be sent back by the other one in order to prevent replay attacks.

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HMAC: How unique does a nonce need to be if the Date is also part of the signature?

In a HTTP scheme where the HMAC-SHA256 signature is sent as part of the Authorization header, and the message input contains: The request method URL Post data Nonce Date HTTP header How unique ...