| 摘要 |
<p>The invention relates to a method of controlling access to a network (2) comprising numerous users having a personal operating key. The inventive method comprises the following steps consisting in: before a pre-determined period of time, saving a group of service keys in a memory element of a system (2) of each user, each of said keys being valid for a fraction of the pre-determined time period and each service key being encrypted first using the personal operating key and an activation key specific to a fraction of the pre-determined time period; at the start of each fraction of the pre-determined time period, transmitting the activation key corresponding to the relevant fraction of the pre-determined time period to each system (2) via the network; and decrypting the encrypted service key in each system using the personal operating key and the activation key.</p> |
