Patent ID: 7769174
Filing Date: 2010-08-03
Classification: G11B,H04L

Abstract:
1. A device for encrypting digital data, comprising: a storage configured to store first encrypted digital data received from a digital data server; an authenticating unit configured to authenticate a target apparatus using an identification information received from the target apparatus, the identification information being associated with the target apparatus; a decrypting unit configured to generate decrypted digital data by decrypting the first encrypted digital data using a first key; an encrypting unit configured to generate second encrypted digital data by encrypting the decrypted digital data using a second key, wherein the second key is calculated at the encrypting unit by performing an addition operation by using a first internal key and the identification information, and generating the second key based on a result of the addition operation and a second internal key using a predetermined encryption algorithm, and wherein the first and second internal keys are included in the device; and a transmitting unit configured to transmit the second encrypted digital data to the target apparatus without the second key, wherein the second key is not transmitted to the target apparatus.