| 摘要 |
<p>An authentication method of a prover device (1 ) by a verifier device (2) by means of cryptographic coupons is provided for, wherein a coupon comprises, on one hand, a pseudo-random number r i, where i is an index for labeling the coupon, and, on the other hand, a reduced-coupon x i such that x i = f(r i), where f is a predetermined one-way function, comprising at least the following steps: the verifier device (2) sends a challenge consisting of a random value c to the prover device (1 ); the prover device (1 ) sends to the verifier device (2) a response y calculated by using a pseudo-random numberr i, said challenge c, and a secret key s belonging to the prover device (1 ); and the verifier device checks the validity of said response y based on the challenge c, the reduced- coupon x i corresponding to said pseudo-random number r i , and a public key V corresponding to said secret key s. According to the invention, the verifier device (2) receives said reduced-coupon x i from a source (3) external to the prover device (1 ).</p> |
