Patent ID: 8243934
Filing Date: 2012-08-14
Classification: H04L

Abstract:
1. An electronic device comprising: a storage unit which stores an inherent key and a key index corresponding to the inherent key; and a control unit which generates an encryption key, encrypts the encryption key using the inherent key, and transmits the encrypted encryption key and the key index to a recording medium, wherein the inherent key is a key which encrypts and decrypts the encryption key and is assigned to and stored in the electronic device during manufacture, the encryption key is a key which encrypts and decrypts content, when the inherent key becomes inaccessible, the control unit transmits the key index received from the recording medium to a server device, receives the inherent key corresponding to the transmitted key index, from the server device, decrypts the encrypted encryption key received from the recording medium using the received inherent key, re-encrypts the decrypted encryption key using a new inherent key, and transmits the re-encrypted encryption key to the recording medium.