Method and system for personal identification using proofs...

G - Physics – 07 – F

Patent

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G07F 7/12 (2006.01) G07F 7/10 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2073065

The method and system are used to generate and to verify a personal identification card. The method begins with the generation of the signature z (130). Then, the authorizing party stores the password on the card along with the signature z and one of four predetermined factors (132). The method continues with the presentation of the card for verification (134). Upon presentation of the card, a test is made to determine if a predetermined number of legitimacy proofs have been carried out (136). If the proofs have been carried out, then z is accepted (138). If the proofs have not been carried out, then a random number is generated, squared to yield y, and then y is supplied to the verifier (140). In response to receiving y, the transaction terminal randomly chooses a bit b, and sends the bit to the prover (142). If b = 0, then the prover sends a value x mod M back to the transaction terminal; and, if b = 1, then the prover sends xz mod M back to the transaction terminal (144). If b = 1 and yjQ mod M = W mod M for j, then testing for the number of proofs of legitimacy starts again, otherwise the card is rejected. If b = 0 and W mod M = y; then testing for the number of proofs of legitimacy starts again, otherwise the card is rejected.

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