Patent ID: 7925017
Filing Date: 2011-04-12
Classification: G11B

Abstract:
1. An information recording device comprising: a memory unit containing data, including content data of a plurality of data files, a block permission table defining memory-access control information, and an integrity check value for the block permission table generated based on a memory unit identifier, the memory unit having a data storage area comprising a plurality of blocks, each block of the plurality of blocks comprising a plurality of sectors each sector of the plurality of sectors of each block of the plurality of blocks having a predetermined data capacity; a processing unit for dividing content data of each data file of the plurality of data files into separate content data portions, for storing, for each data file of the plurality data files, a first portion in a first sector of one of the plurality of blocks, and a second portion in a second sector of one of the plurality of blocks, and for storing a security header corresponding to the content data of the plurality of data files in at least one header block of the plurality of blocks, wherein the at least one header block is different from each one of the blocks in which the content data of the plurality of data files is stored; a cryptosystem unit for performing sector level encryption by using a first encryption key to execute encryption of each first sector of each of the plurality of blocks, and using a second encryption key that is different from the first encryption key to execute encryption of each second sector of each of the plurality of blocks; and an integrity checking unit for checking the integrity of the block permission table based on the integrity check value generated based on the memory unit identifier, wherein the security header stored in the header block includes each encryption key used for each sector of each of the plurality of blocks.