| US 7,603,567 B2 | ||
| Information processing system and information processing method | ||
| Hirofumi Kanai, Fukaya (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Feb. 18, 2004, as Appl. No. 10/779,633. | ||
| Claims priority of application No. 2003-043030 (JP), filed on Feb. 20, 2003. | ||
| Prior Publication US 2005/0172139 A1, Aug. 04, 2005 | ||
| Int. Cl. H04L 9/38 (2006.01); H04L 9/16 (2006.01); H04L 9/32 (2006.01) | ||
| U.S. Cl. 713—189 [713/310] | 16 Claims |
| 1. An information processing system comprising:
a potential detection section which detects a predetermined potential applied to a serial bus terminal;
a power supply section which supplies the predetermined potential to each component part as a source potential upon detection
of the predetermined potential by the potential detection section;
an information detection section which detects command information from an external device supplied to the serial bus terminal;
a determining section which determines a key operation mode for performing a process in accordance with at least operating
information supplied from an operation switch operated by a user arranged on a body, before the information detection section
detects the command information and after the potential detection section detects the predetermined potential, and
which changes the key operation mode to a command operation mode for performing a process in accordance with the command information
supplied to the serial bus terminal, after the information detection section detects the command information; and
a processing section which executes one of an encryption process and a decryption process in accordance with the operation
mode determined by the determining section.
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