Patent ID: 7730320
Filing Date: 2010-06-01
Classification: G11B,H04L

Abstract:
1. A method of generating data for detecting tampering of a piece of content key information stored in a target apparatus, comprising the steps of: extracting data at a predetermined position in each of a plurality of pieces of content key information, which include the piece of content key information and are encrypted using a piece of domain key information with a chain encryption technique, to obtain a plurality of extracted data; concatenating the plurality of extracted data to obtain concatenated data; performing a hash calculation with respect to the concatenated data to obtain a chain hash value; and storing the chain hash value in the target apparatus; wherein: the piece of domain key information is stored in a first area of the target apparatus, the chain hash value stored in the target apparatus is included in the piece of domain key information, and the plurality of pieces of content key information are stored in a second area of the target apparatus different from the first area.