Code conversion apparatus, code conversion method, and computer product

Abstract

A code conversion apparatus, a disk drive, a code buffer, and an encryption buffer are included in a storage. The code buffer stores therein first encrypted data present in the disk drive, and the encryption buffer stores therein first unencrypted data present in the disk drive. An encrypting unit encrypts the first unencrypted data present in the encryption buffer to predetermined encrypted data, and a decrypting unit decrypts the first encrypted data present in the code buffer to second unencrypted data. Moreover, a re-encrypting unit decrypts the first encrypted data present in the code buffer to third unencrypted data and encrypts the third unencrypted data to second encrypted data different from the first encrypted data.

Description

technical field [0001] The present invention relates to techniques for encrypting and decrypting data stored in disk drives of storage. Background technique [0002] In a storage device that manages data stored in a plurality of disk drives constituting the storage device, data security needs to be improved. In response to this, data stored in the disk drive has been encrypted. [0003] For example, a technology related to an encryption device for encrypting data in a disk drive is disclosed in Japanese Patent Application Laid-Open No. 2006-127061. The disclosed encryption device is provided outside the disk drive (storage device). Upon receiving an instruction to encrypt or decrypt data from a user, the encryption device reads data stored in the disk drive to perform encryption or decryption, and returns the encrypted or decrypted data to the disk drive. [0004] However, in the conventional art, reading data in the disk drive is time-consuming because the encryption dev...

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional technology, reading data in the disk drive is time-consuming because the encryption device reads the data in the disk drive and then encrypts or decrypts the read data.

Therefore, it is time consuming to encrypt or decrypt data and read / write requests from the host, causing the disk drive to stall

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