Patent ID: 7054613

Claim:
A method for protecting an interface between a mobile device for a wireless telecommunications system and a smart card, comprising: generating a first key in the mobile device and a second key in the smart card; generating a first authentication value in the mobile device using the first key and generating a second authentication value in the smart card using the second key; and comparing the generated first and second authentication values, wherein use of at least one of the mobile device and the smart card is enabled based on a result of the comparison; wherein the mobile device includes a first algorithm and the smart card includes a second algorithm, and wherein the first key is generated in the mobile device using the first algorithm and the second key is generated in the smart card using the second algorithm; wherein the first key is generated from the first algorithm using an input Personal Identification Number and an input key generated from a randomly generated value, and wherein the second key is generated from the second algorithm using the input Personal Identification Number, a key provided in the smart card and the randomly generated value.