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Journal of Cryptology

, Volume 9, Issue 1, pp 35–67 | Cite as

On-line/off-line digital signatures

  • Shimon Even
  • Oded Goldreich
  • Silvio Micali
Article

Abstract

A new type of signature scheme is proposed. It consists of two phases. The first phase is performed off-line, before the message to be signed is even known. The second phase is performed on-line, once the message to be signed is known, and is supposed to be very fast. A method for constructing such on-line/off-line signature schemes is presented. The method uses one-time signature schemes, which are very fast, for the on-line signing. An ordinary signature scheme is used for the off-line stage.

In a practical implementation of our scheme, we use a variant of Rabin's signature scheme (based on factoring) and DES. In the on-line phase all we use is a moderate amount of DES computation and a single modular multiplication. We stress that the costly modular exponentiation operation is performed off-line. This implementation is ideally suited for electronic wallets or smart cards.

Key words

Digital signatures Integer factorization RSA DES One-time signature schemes Error-correcting codes Chosen message attack 

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Copyright information

© International Association for Cryptologic Research 1996

Authors and Affiliations

  • Shimon Even
    • 1
  • Oded Goldreich
    • 2
  • Silvio Micali
    • 3
  1. 1.Computer Science DepartmentTechnion-Israel Institute of TechnologyHaifaIsrael
  2. 2.Department of Applied Mathematics and Computer ScienceWeizmann Institute of ScienceRehovotIsrael
  3. 3.Laboratory for Computer ScienceMassachusetts Institute of TechnologyCambridgeU.S.A.

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