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Security of signature schemes in a multi-user setting

Nigel Smart, Alfred Menezes, Security of signature schemes in a multi-user setting. Designs, Codes and Cryptography, 33, pp. 261–274. August 2004. No electronic version available. External information


This paper initiates the study of the security of signature schemes in the multi-user setting. We argue that the well-accepted notion of security for signature schemes, namely existential unforgeability against adaptive chosen-message attacks, is not adequate for the multi-user setting. We propose an extension of this security notion to the multi-user setting and show that signature schemes proven secure in the single-user setting can, under reasonable constraints, also be proven secure in the multi-user setting.

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