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Nonce

Also known as Number Once. This is a randomly/semi-randomly generated number that is used in cryptography to protect the privacy of messages. The US Department of Commerce’s National Institute of Standards and Technology (NIST) defines a cryptographic nonce as, “A random or non-repeating value that is included in data exchanged by a protocol, usually for the purpose of guaranteeing the transmittal of live data rather than replayed data, thus detecting and protecting against replay attacks”.

Note: These are non-technical definitions meant for a general audience and should not be used as legal definition
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