Method of protecting a mobile-telephone-type telecommunication terminal

摘要

A method of protecting a telecommunication terminal having a chip-card-type personal component which is required for telecommunication network access. The terminal includes a processing unit, at least one operating memory element containing the information necessary to the operation of the terminal, i.e. a terminal operating program, and the data necessary to the program. The method involves: a) encrypting the contents of the operating memory element of the telecommunication terminal using a pre-determined key K which is necessary for decryption; and b) allowing the terminal to commence decryption once the terminal has been started with a start-up program that is saved in a secure memory element and once the key for decryption has been calculated by same.

主权项

1. A process for protecting a mobile telecommunication device, the mobile device having a personal software component used to access a communications network, a processing unit, a calculation unit, a secure memory, read-only memory, and at least an operating memory that stores an operating programme and data needed for said programme, said process comprising the following steps:
a) coding, in the processing unit, the operating programme and data stored in the operating memory of the mobile telecommunication device with a pre-determined key K that is generated using unique information associated with the mobile device stored in the secure memory and unique information associated with and stored in the personal software component, and b) enabling a decoding of the operating programme and data with the predetermined key K when:
the mobile device is started using a start programme stored in secure the read-only memory and,the predetermined key K is calculated by the device by accessing the unique information associated with the mobile device stored in the secure memory and accessing the unique information associated with and stored in the personal software component, wherein the decoding is performed by the calculation unit on request from the processing unit, the calculation unit which decodes the operating programme and data in blocks and stores the decoded blocks in a register, wherein the processing unit executes functions based on the decoded blocks, and wherein said personal software component is a chip card.