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Which new RSA signatures can be computed from some given RSA signatures?

extended abstract
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 473)

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.

Key words

RSA scheme RSA signature cryptographic protocol 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  1. 1.Department of Mathematics and Computer ScienceUniversity of LeidenLeidenThe Netherlands
  2. 2.CWI Centre for Mathematics and Computer ScienceAmsterdamThe Netherlands

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