Enciphering device and method, deciphering device and method, and storage medium

Abstract

Data about content is chunked, and the chunks are linked, encrypted, and recorded. Generates an initial value from the content data itself in its sector. In the case of an MPEG stream, an initial value is generated from unique information on the header. Therefore, there is no need to use random numbers to generate initial values, and no loss occurs in the data area. Since the content data changes randomly, the confidentiality is high. Also, since there is no need to use a random number generator, the circuit scale will not increase.

Description

technical field [0001] The present invention relates to being suitable for encrypting content data such as audio data, and recording the encrypted data on an optical disc such as a CD (Compact Disc) 2, so that when the content data is recorded on the optical disc and the content data is reproduced from the optical disc An encryption device, an encryption method, a decryption device, a decryption method, and a storage medium for protecting rights of content data while protecting. Background technique [0002] In recent years, optical discs have been developed as large-capacity recording media. For example, CD (Compact Disc) for audio information, CD-ROM (Compact Disc Read Only Memory) for computer data, and DVD (Digital Versatile Disc or Digital Video Disc) for audio information are all known. . [0003] These discs are read-only discs. In recent years, optical discs such as CD-R (Compact Disc Recordable) discs and CD-RW (Compact Disc Rewritable) discs which allow data to ...

AI Technical Summary

Problems solved by technology

However, when configuring such a random number generating circuit, the scale of the circuit disadvantageously increases

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