Data processing apparatus

Abstract

Upon encrypting and storing data C on a recording medium, data B corresponding to data C is embedded in a padding area together with parity data for data B and C as padding data, and data B and parity data are encrypted in correspondence with data C.

Description

technical field [0001] The invention relates to a data processing device which processes data which must be kept secret. Background technique [0002] Data encryption techniques are applied to various data processing devices that process data that must be kept secret. For example, when recording information on a recording medium such as an optical disc, it is necessary to record it after encrypting the information. In a copyright protection method, an encryption key is used to encrypt content as a work to obtain encrypted content, and another encryption key is used to encrypt an encryption key used in encryption to obtain an encrypted key, so that This key is kept secret. The encrypted key is recorded on the recording medium together with the encrypted content, thus preventing unauthorized copying. [0003] In this data encryption technique, when encrypting and storing data, it is necessary to adjust the data to the block size of the encryption algorithm. Traditionally, ...

AI Technical Summary

Problems solved by technology

[0005] However, this encryption technique requires complex processing such as processing of generating a data block including a random number having the same size as the original data, attaching an error correction code to the random data block using the same error correction code generation method as the original data processing, etc., and significantly increases the size of the data to be recorded

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