ENCRYPTION KEY RECOVERY METHOD, INFORMATION PROCESSOR, AND ENCRYPTION KEY RESTORATION PROGRAM

PROBLEM TO BE SOLVED: To provide an encryption key recovery method, an information processor, and an encryption key restoration program capable of restoring an encryption key stored in a secure memory even if usage of the key becomes impossible. SOLUTION: The encryption key recovery method is for the information processor 1 which stores an encryption key in a secure memory 11 and stores data encrypted by the encryption key in an internal storage 13. A key management module 21 contained in the information processor 1 has an encryption key check step for checking the authenticity of the encryption key, a restoration key check step for acquiring a key 73 for restoration of the encryption key from outside of the information processor 1 to check the authenticity of the key 73 when there is no authenticity in the encryption key, an encryption key restoration step for storing the key 73 in a secure memory 11 when there is the authenticity in the key 73, and a normal activation instruction step for activating the information processor 1 at a normal mode by restarting. According to the arrangement, the problem to be solved can be solved. COPYRIGHT: (C)2009,JPO&INPIT