Non-repudiation definitions

To be unable to reject the validity of a document (unable to prove it is counterfeit). The term is the opposite of "repudiate," which means to reject the validity of something.Digital signatures and certificates provide non-repudiation because they guarantee the authenticity of a document or message. As a result, the sending parties cannot deny that they sent it (they cannot repudiate it). Non-repudiation can also be used to ensure that an email message was opened (see email tracker).
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Referring to a mechanism that proves that the originating node sent a message and that the receiving node received it.Therefore, the sender cannot deny sending the message and the receiver cannot deny having received it. Non-repudiation can be effected through digital signatures, confirmation receipts, and timestamps. See also digital signature.
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(law) Assurance that a contract cannot later be denied by either of the parties involved.
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(telecommunications) Assurance that the claimed sender or recipient is in fact the party who sent or received a given message.
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Alternative spelling of nonrepudiation.
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Origin of non-repudiation