| 摘要 |
In a method and a system for increasing the security in a system comprising and communicating with a removable memory card, such as a SIM card or smart card a new function is added in the existing SIM card so that the SIM-card will challenge the system. Thus, the SIM-card will issue a random number towards the network and the network then has to respond with a correct result. If not the SIM-card will be automatically switched off. The use of the method and the system will reduce the risque for someone to find out the correct code of the removable memory card by means of a massive test. The method can also be employed in other systems where the system communicates with an electronic device. |
