| 摘要 |
The present invention relates to a microcircuit comprising a memory (M) where a secret installation key (K1) is stored, means for receiving a program to be installed and a program-specific check value from external equipment, and a processor (P) for executing a predetermined installation program (INST) which checks on the basis of the secret installation key (K1) stored in the memory (M) and the program-specific check value (T1, T2) whether the program (PROG1, PROG2) to be installed is authentic and which installs said program if the check finds it authentic. To make sure that the secret installation key would not fall in the hands of outsiders even after installation, the microcircuit (4) is arranged to delete the secret installation key (K1) from the memory (M) prior to starting the program installed by the installation program (INST).
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