United States Patent [191 Schnorr [54] Method for Identifying Subscribers and for Generating and Verifying Electronic Signatures in a Data Exchange System [30] Foreign Application Priority Data Other Publications

  • Thomas H. Tarcza

Abstract

Simpson [57] ABSTRACT In a data exchange system working with processor chip cards, a chip card transmits coded identi?cation data I, v and, proceeding from a random, discrete logarithm r, an exponential value x=2' (mod p) to the subscriber who, in turn, generates and transmits a random bit se quence e to the chip card. By multiplication of a stored, private… (More)

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