PROGRAM EXECUTION PROTECTION PROCESSOR

摘要

PROBLEM TO BE SOLVED: To provide a program execution protection processor capable of protecting execution environment of a task from unauthorized access from the outside without imposing a processing load of encryption or the like when execution of a program is suspended.

SOLUTION: This program execution protection processor has: a task execution means executing a task; a cipher information acquisition means 4 acquiring cipher information wherein a decryption key is encrypted according to requirement from the task; a decryption means 5 decrypting an encrypted program code and/or data by the decryption key obtained by the decryption; an internal memory 7 having a private page storing the program code and/or data decrypted by at least the decryption means 5, assigned according to the requirement from the task; and an access decision means 8 deciding whether access to the private page by the task is permitted or not.

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