Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1990-02-23
1991-02-19
Tarcza, Thomas H.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 30, 380 25, 380 46, H04K 100
Patent
active
049950827
ABSTRACT:
In a data exchange system working with processor chip cards, a chip card transmits coded identification data I, v and, proceeding from a random, discrete logarithm r, an exponential value x=2.sup.r (mod p) to the subscriber who, in turn, generates and transmits a random bit sequence e to the chip card. By multiplication of a stored, private key s with the bit sequence e and by addition of the random number r, the chip card calculates a y value and transmits the y value to the subscriber who, in turn, calculates an x value from the information y, v.sub.j and e and checks whether the calculated x value coincides with the transmitted x value. For an electronic signature, a hash value e is first calculated from an x value and from the message m to be signed and a y value is subsequently calculated from the information r, s.sub.j and e. The numbers x and y then yield the electronic signature of the message m.
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Beth, T., "Efficient Zero-Knowledge Identification Scheme for Smart Cards", Advances in Cryptology-Eurocrypt, '80, pp. 77-84.
Cain David
Tarcza Thomas H.
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