Non-repudiation is the assurance that someone cannot deny something.

Related to cryptography, non-repudiation refers (among a few other things) to the ability to ensure that a party to a communication cannot deny the authenticity of their signature on a message that they originated.

For example: a 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.

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