Secure Processing Device and Secure Processing System

An integrated circuit comprising:

• a program storage unit that stores a plurality of protected programs that have been generated based on an original program such that execution results of the original program and the protected programs are same;
• a disabling unit operable to disable one of the protected programs that has been analyzed;
• a selection unit operable to select one of the protected programs that is not disabled;
• and
• an execution unit operable to execute the selected one of the protected programs.

A secure processing method used by a secure processing apparatus,

• the secure processing apparatus storing a plurality off protected programs that have been generated based on an original program such that execution results of the original program and the protected programs are same, and
• the secure processing method comprising:
• a disabling step of disabling one of the protected programs that has been analyzed;
• a selection step of selecting one of the protected programs that is not disabled;
• and
• an execution step of executing the selected one of the protected programs.

A secure processing system that includes a secure processing apparatus and a program update server connected with each other via a network,

• the secure processing apparatus comprising:
• a first storage unit that stores a plurality of protected programs that have been generated based on an original program such that execution results of the original program and the protected programs are same;
• a disabling unit operable to disable one of the protected programs that has been analyzed;
• a selection unit operable to select one of the protected programs that is not disabled;
• an execution unit operable to execute the selected one of the protected programs;
• and
• a request unit operable to request the program update server for a protected program if the number of protected programs that are not disabled is not more than a prescribed threshold value, and
• the program update server comprising:
• a second storage unit that stores a plurality of protected programs;
• a request reception unit operable to receive a request from, the request unit for the protected program, and
• the transmission unit operable to read one or more of the protected programs from the second storage unit upon reception of the request by the request reception unit, and transmit the read protected programs to the secure processing apparatus.