METHOD AND DEVICE FOR ENCIPHERING DEVICE KEY, METHOD AND DEVICE FOR DECIPHERING DEVICE KEY, METHOD AND DEVICE FOR ENCIPHERING/DECIPHERING DEVICE KEY, AND PROGRAM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method and a device for enciphering device keys, a method and a device for deciphering device keys, a method and a device for enciphering and deciphering device keys, and a program therefor for keeping device keys secret to the third party and making it very difficult for the third party to wrongfully acquire the device keys.;SOLUTION: On a single LSI 14, there are provided: a device characteristic value 17 being a prescribed fixed value, a key generation means 18 which uses the device characteristic value 17 and apparatus characteristic information 16 given to an apparatus to generate a key for enciphering a device key 11 being the source for generating a content key; and a device key enciphering means 12 which uses the key generated by the key generation means 18 to encipher the device key 11 and outputs the enciphered device key.;COPYRIGHT: (C)2004,JPO&NCIPI