Patent ID: 7620822

Claim:
A server apparatus in an information processing system, the server apparatus communicating with a client apparatus including a client device and a client tamper-resistant device, the server apparatus comprising: a server tamper-resistant device; and a server device, wherein the server tamper-resistant device includes a processor configured to execute computer readable instructions that implements a command generation mechanism that generates one or more commands from the server device, encryption means for encrypting the commands and information corresponding to a request from the server device in accordance with key information managed by the server tamper-resistant device and by the client tamper-resistant device and generating a first encryption signal, and decryption means for decrypting a second encryption signal encrypted by the client tamper-resistant device in accordance with the key information; and the server device includes communication means for performing first communication and second communication with the client device, the first communication not requiring encryption based on the key information, requesting means for requesting the server tamper-resistant device to perform encryption based on the key information when the server performs the second communication with the client device and sending a predetermined request to the server tamper-resistant device in accordance with a set order, the second communication requiring encryption based on the key information, and processing means for performing processing corresponding to a signal decrypted by the decryption means of the server tamper-resistant device, wherein the encryption means comprises means for generating and encrypting either a read command or a write command.