Unforgeability and Non-repudiation Sample Clauses

Unforgeability and Non-repudiation. In some applications, a participant may require that his or her messages cannot be forged by other participants. Symmetrically, the recipient of a message, especially of one that contains key materials, may require that the sender of the message cannot repudiate at a later stage the fact that he or she is the originator of the message. We envisage that in electronic commerce, non-repudiation and unforgeability of key materials and actual communication sessions that employ a key derived from the key materials is of particular importance. Both unforgeability and non-repudiation can be achieved by using digital signature. With a secret key based protocol, however, neither unforgeability nor non-repudiation can be achieved, unless the protocol involves a KDC, possibly together with tamper-resistant devices. Unforgeability and non-repudiation are closely related to identi cation. In particular, unforgeability or non-repudiation cannot be accomplished unless a key establishment pro- tocol is also an identi cation protocol. Let us turn our attention to high speed networks. In a (draft) document prepared by the ATM Forum [15], accountability for all ATM network service invocations and management activities, as well as for each individual entity's actions, has been identi ed as one of the four main security objectives, with the other three being con dentiality, data integrity and availability. This objective would not be achieved unless key establishment protocols employed ful ll unforgeability and non-repudiation.
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Related to Unforgeability and Non-repudiation

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