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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 cryptography, signcryption is a public-key primitive that simultaneously performs the functions of both digital signature and encryption. Encryption and digital signature are two fundamental cryptographic tools that can guarantee the confidentiality, integrity, and non-repudiation. Until 1997, they were viewed as important but distinct ...
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 ...
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The accepted best practice is to use separate private keys (and associated certificates) for signature and for encryption, as this permits escrow of the encryption key without compromise to the non-repudiation property of the signature key. Encryption requires having the destination party's certificate on store (which is typically automatic ...
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