nonrepudiation
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nonrepudiation



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DEFINITION - In general, nonrepudiation is the ability to ensure that a party to a contract or a communication cannot deny the authenticity of their signature on a document or the sending of a message that they originated. On the Internet, the digital signature is used not only to ensure that a message or document has been electronically signed by the person that purported to sign the document, but also, since a digital signature can only be created by one person, to ensure that a person cannot later deny that they furnished the signature.

Since no security technology is absolutely fool-proof, some experts warn that the digital signature alone may not always guarantee nonrepudiation. It is suggested that multiple approaches be used, such as capturing unique biometric information and other data about the sender or signer that collectively would be difficult to repudiate.

LAST UPDATED: 27 Feb 2005

Read more about nonrepudiation:
- Cryptographic expert Bruce Schneier believes that "Digital Signatures Are Not Signatures."
- SearchSecurity.com provides "Best Web Links" to information about digital signatures.


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