Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
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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Oka Yoshimi
Saito Nobuyuki
Avery Jeremiah
Oliff & Berridg,e PLC
Seiko Epson Corporation
Sheikh Ayaz
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