Patent ID: 9165164
Filing Date: 2015-10-20
Classification: G06F,G09C

Abstract:
1. A cryptographic processing apparatus for storage medium, comprising: a memory including a buffer; a location information conversion unit that stores a first conversion result in the buffer, the first conversion result obtained by performing a conversion process on first location information indicating a location of first data to be accessed on the storage medium; and a data cryptographic processing unit that performs cryptography processing on the first data using the first conversion result stored in the buffer, the cryptography processing being one of encryption and decryption, wherein the location information conversion unit stores, in the buffer, a second conversion result obtained by performing a conversion process on a second location information, the second location information, corresponding to second data to be processed after the first data, is corrected in accordance with a length of the data to be accessed and at least while the data cryptographic processing unit performs the cryptography processing on the first data, the location information conversion unit starts a conversion process on the second location before the data cryptographic processing unit completes cryptography processing on the first data, wherein the location information conversion unit and the data cryptographic processing unit are stored in the memory.