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Secret Key Cryptography and Nonrepudiation

Secret key cryptography alone is not sufficient to prevent the denial of an action that has taken place such as the initiation of an electronic transaction. Despite the fact that one can apply data confidentiality between two communicating entities, the fundamental flaw of a nonrepudiation scheme that is based on secret key cryptography alone is inherent to the fact that the secret key is dispensed to more than one party.

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