Abstract: An information processing device includes a control unit, a hash unit, and a comparison unit. The control unit runs a program and to store flow control information of the program in a call stack. The hash unit generates a first hash value by applying a hash function to selected data in response to a first context change of the program. The control unit starts or resumes a second process or thread of the program only when the hash unit has generated the first hash value. The hash unit generates a second hash value by re-applying the hash function to the selected data in response to a second context change. The first and second context changes include a termination or interruption of the first process or thread and the second process or thread. The comparison unit determines whether the first hash value and the second hash value are identical.

Abstract: An information processing device comprises a control unit, a hash unit, and a comparison unit. The control unit is arranged to run a program and to store at least flow control information of the program in a call stack. The hash unit is arranged to generate a first hash value by applying a hash function to selected data in response to a first context change of the program, the selected data comprising at least one or more selected items of the call stack, the first context change comprising a termination or interruption of a first process or thread of the program. The control unit is further arranged to start or resume a second process or thread of the program only when the hash unit has generated the first hash value. The hash unit is further arranged to generate a second hash value by re-applying the hash function to the selected data in response to a second context change, the second context change comprising a termination or interruption of the second process or thread.