Method for protecting a microcomputer system against software manipulation

摘要

A method for protecting a microcomputer system against manipulation of its program, the microcomputer system including a rewritable memory in which at least part of the program is stored. A code word is generated on the basis of a start value, using at least part of the contents of the rewritable memory. For enhanced protection of the program against manipulation or tuning, the start value for generating the code word is preselected on a microcomputer-specific basis. The start value is also preselected as a function of the type of microcomputer system. The generated code word is checked in the microcomputer system, and execution of the program of the microcomputer system stored in the rewritable memory is blocked if the code word does not match a preselectable reference code word.