TAMPER RESISTANCE WITH PSEUDO-RANDOM BINARY SEQUENCE PROGRAM INTERLOCKS

摘要

PURPOSE: A tamper resistance with pseudo-random binary sequence program interlocks is provided to increase security of software. CONSTITUTION: The pseudo random binary sequence generators(110,120) are related to each of such distinguished sections and each of them can be made incremental according to call and execution of the functions. Values of the pseudo random binary sequences are compared with each other before permitting or preventing further execution of the software. This comparison can be executed at all privileged levels and additional security is provided by using an additional privileged function to execute the comparison by modification of tamper resistance.