| 摘要 |
<p>The invention relates to the encrypted transmission of information (Kd) between two microprocessor cards (CM, CP). The information is encrypted in the first card, the encrypted information is transmitted from the first card to the second, and the information is decrypted in the second card. The feature of the invention is that use is made of an encryption key drawn from a store of potential keys which consists of the read-only memory (120 for CM, 220 for CP) of the card. An index, generated by the first card and transmitted to the second card, is used so that the two cards may use the same key without transferring this key in clear between the two cards. The key is the contents of the read-only memory file at the address defined by the index. Application to the transmission of a secret key (Kd), diversified from a base key (KF), between a diversification card (CM) and a card to be personalised (CP). <IMAGE></p> |
