Patent ID: 7219238
Filing Date: 2007-05-15
Classification: G06F,H04N

Abstract:
1. A data transfer control device for data transfer through a bus, comprising: a second memory access control circuit which encrypts data transferred from a first bus side in accordance with a second encryption process, and writes the thus-encrypted data to a second memory; a third memory access control circuit which reads the encrypted data that has been written to the second memory, and transfers the thus-read encrypted data to a second bus side where a storage medium is connected; and a first memory access control circuit which decrypts data by a first decryption process and writes the decrypted data to a first memory provided within the data transfer control device, the data having been encrypted by a first encryption process, which differs from the second encryption process, and then transferred from the first bus side, wherein the second memory access control circuit reads the data that has been written to the first memory, encrypts the thus-read data by the second encryption process, and writes the encrypted data to the second memory.