Data transfer control device, electronic instrument, and...

Details Data transfer control device, electronic instrument, and... Data transfer control device, electronic instrument, and...

2007-05-15

2007-05-15

Sheikh, Ayaz (Department: 2131)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S153000, C713S189000, C709S228000, C380S283000, C711S165000

Reexamination Certificate

active

10379910

ABSTRACT:
Data to be transferred from a BUS1(IEEE 1394 or USB) is encrypted by a second encryption process (DES) and the encrypted data is written to an external SDRAM through an external terminal of a data transfer control device. The encrypted data that has been written to the SDRAM is read through the external terminal, and the thus-read encrypted data is transferred to a BUS2to which an HDD is connected. Encrypted data transferred from the BUS1is decrypted by a first decryption process (DTCP), and is written to a small-capacity SRAM within the data transfer control device. The thus-written decrypted data is read from the SRAM and encrypted by the second encryption process. Paths that bypass the second encryption (or decryption) are also provided.

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