INFORMATION SECURITY DEVICE

摘要

There is a request for a technique for safely and easily distributing to each device, a device key corresponding to a new encryption method introduced. A content reproducing device (100) corresponding to the request includes a rewritable FPGA (122). The content reproducing device (100) acquires a key generation circuit program constituting a key generation circuit for generating a device key appropriate for the new encryption method. According to a key generation circuit program acquired, the FPGA (122) is rewritten to build a key generation circuit. A device key appropriate for the new encryption method is generated by the key generation circuit which has been built.