KEY CONTROL METHOD AND SYSTEM THEREFOR AND DATA PROCESSOR

摘要

PROBLEM TO BE SOLVED: To provide a key control method that can effectively avoid IC (Inte grated Circuit) key data from illegally being leaked and falsified. SOLUTION: A key control device 2 issues a unique identification data to each IC respectively to a plurality of ICs 5, the key control device 2 issues a base key data BK, and a key control source 12 provides the identification data ID and the base key data BK to an IC issue source 13. An IC issue device 3 applies processing based on a prescribed key generating algorithm to the identification data ID and the base key data BK to generate IC key data respectively corresponding to a plurality of the ICs 5 and writes the generated IC key data to the corresponding ICs 5.