Which new RSA signatures can be computed from some given RSA signatures? (extended abstract)

  • Authors:
  • Jan-Hendrik Evertse;Eugène van Heyst

  • Affiliations:
  • -;-

  • Venue:
  • EUROCRYPT '90 Proceedings of the workshop on the theory and application of cryptographic techniques on Advances in cryptology
  • Year:
  • 1991

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Abstract

We consider protocols in which a signature authority issues RSA-signatures to an individual. These signatures are in general products of rational powers of residue classes modulo the composite number of the underlying RSA-system. These residue classes are chosen at random by the signature authority. Assuming that it is infeasible for the individual to compute RSA-roots on randomly chosen residue classes by himself, we give, as a consequence of our main theorem, necessary and sufficient conditions describing whether it is feasible for the individual to compute RSA-signatures of a prescribed type from signatures of other types that he received before from the authority.