DATA PROCESSING SYSTEM, DATA PROCESSING DEVICE AND DATA PROCESSING METHOD

摘要

A first data processing device (1) stores a service key and a predetermined function, while a second data processing device (2) stores unique identification information, a license key, a version data indicative of the version of the license key, and the predetermined function. The first data processing device makes a request for the identification information, applies the function to them to generate a first intermediate key Km, applies the function to the first intermediate key n times to generate a decision key Kmn, and transmits count data that indicates the number of times the function was applied. The second data processing device (2) applies the function (n-Gb) times based on the count data to generate a second intermediate key Klic_n, and transmits intermediate key information R indicating the information about the second intermediate key Klic_n. The first data processing device then verifies the second data processing device (2) according to the decision key Kmn and the intermediate key information R.