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In law, non-repudiation is a situation where a statement's author cannot successfully dispute its authorship or the validity of an associated contract. [1] The term is often seen in a legal setting when the authenticity of a signature is being challenged. In such an instance, the authenticity is being "repudiated". [2]
Further, some non-repudiation schemes offer a timestamp for the digital signature, so that even if the private key is exposed, the signature is valid. [ 18 ] [ 19 ] Digitally signed messages may be anything representable as a bitstring : examples include electronic mail, contracts, or a message sent via some other cryptographic protocol.
In the case of a qualified electronic signature as defined in the eIDAS-regulation, the signer's identity is even certified by a qualified trust service provider. This linking of signature and authentication firstly supports the probative value of the signature – commonly referred to as non-repudiation of origin. The protection of the message ...
Thus, digital signatures do offer non-repudiation. However, non-repudiation can be provided by systems that securely bind key usage information to the MAC key; the same key is in the possession of two people, but one has a copy of the key that can be used for MAC generation while the other has a copy of the key in a hardware security module ...
One way to address non-repudiation is using digital signatures. [17] A digital signature not only ensures that a message or document has been electronically signed by the person, but since a digital signature can only be created by one person, it also ensures that this person cannot later deny that they provided their signature. [19]
An electronic signature, or e-signature, is data that is logically associated with other data and which is used by the signatory to sign the associated data. [1] [2] [3] This type of signature has the same legal standing as a handwritten signature as long as it adheres to the requirements of the specific regulation under which it was created (e.g., eIDAS in the European Union, NIST-DSS in the ...
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Although the use non-repudiation is widespread in the literature it is remarkably awkward and hard to use. By itself non-repudiation is a noun but what we often want is an adjective. Following usual English practice for turning a noun into an adjective we get non-repudiate-ability which is about as awkward and unpronounceable as it could be.