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Digital signature schemes are a fundamental tool for secure distributed systems. R is important to have a formal notion of what a secure digital signatur e scheme is, so that there is a clear interface between designers and of such schemes. A definition that seemed final was given by Goldwasser, Micali, and Rivest in 1988, and although most signatare schemes used in practice cannot be proved secure with respect to it, they are all built so that they hopefully fuLrd it, e.g., by the inclusion of hash functions or redundancy to counter active an~-ks Recently, however, several signature schemes with new security prope~es have been presented. Most of them exist in several variants, and some of them pay for the new properties with restrictions in other respects, whose relation is not always clear. Obviously, these new properties need definitions and some classification. Unfortunately, however, none of the new schemes is covered by the definition mentioned above. Hence the new properties cannot be defined as additions, but each new type of scheme needs a new defndtion from scratch, although there are similarities between the definitions. This is unsatisfactory. This paper presents (an ov

Author

Birgit Pfitzmann

Publisher

ACM Press

Published

1993

Language

EN