| 摘要 |
PROBLEM TO BE SOLVED: To enhance a security level in an identification method applied to unlocking/locking of automobile doors. SOLUTION: A key 40 reads an ID code IDCD and random numbers CD0 to CD3 from a fixed value memory 11 and summating an overlap prohibit data OVLP_0 and a random number RND 1 newly creates overlap prohibit data OVLP. Then a random number generator 15 generates authentication purpose random number data RND2 and encrypting the identification purpose random number data RND2 on the basis of the ID code IDCD and the random numbers CD0 to CD3 creates encrypted data CRND2. Then the ID code IDCD, the overlap prohibit data OVLP, the identification purpose random number data RND2, and the encrypted data CRND2 are transmitted to a lock 50. The lock 50 investigates the ID code, the overlap prohibit data, and the random number data on the basis of them and performs authentication only when every investigation indicates normality. COPYRIGHT: (C)2004,JPO |
