![]() ![]() ![]() For example, nonces used as challenges in challenge-response authentication protocols SHALL not be repeated until authentication keys are changed. Source(s): NIST SP 800-44 Version 2 under Nonce A value used in security protocols that is never repeated with the same key. The receiver denies connections that do not have the correctly encrypted nonce. Because the sender randomly generated the nonce, this defeats playback attacks because the replayer cannot know in advance the nonce the sender will generate. The receiver encrypts it using the agreed upon secret key and returns it to the sender. One party randomly generates a nonce and sends it to the other party. Source(s): NIST SP 800-38C under Nonce NIST SP 800-38D under Nonce A randomly generated value used to defeat “playback” attacks in communication protocols. Source(s): NIST SP 800-38A under Nonce A value that is used only once within a specified context. 1 under Nonce A value that is used only once. Source(s): NIST SP 800-102 under Nonce A time-varying value that has at most a negligible chance of repeating for example, a random value that is generated anew for each use, a time-stamp, a sequence number, or some combination of these. IETF RFC 4949 Ver 2 A time-varying value that has at most a negligible chance of repeating, for example, a random value that is generated anew for each use, a timestamp, a sequence number, or some combination of these. ![]() 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. ![]()
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