| 摘要 |
PCT No. PCT/FR95/00607 Sec. 371 Date Jan. 11, 1996 Sec. 102(e) Date Jan. 11, 1996 PCT Filed May 9, 1995 PCT Pub. No. WO95/30976 PCT Pub. Date Nov. 16, 1995The invention relates to a method and an apparatus for producing a key that is common to two devices that belong to different sets and are intended to implement a common cryptographic procedure. Each device is assigned a mother key (KC, KP) and a daughter key (KPck, KCpi). The daughter key is developed on the basis of the mother key of the other device and of an identification datum specific to the device. When the procedure is performed, the two devices exchange their identification datum (ck, pi), which when processed with the aid of the mother key held by the device will yield the daughter key (KCpi, KPck) of the other device. The pair of keys formed by the daughter key already held and by the daughter key that is calculated constitutes the common key. |
