PORTABLE ELECTRONIC DEVICE AND CONTROL METHOD OF PORTABLE ELECTRONIC DEVICE

• US 20080237333A1
• Filed: 03/17/2008
• Published: 10/02/2008
• Est. Priority Date: 03/29/2007
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Fukuda, Aki, Ishibe, Kazuhiro
• Granted Patent: US 7,775,423 B2
• Time in Patent Office: Days
• US Class Current: 235/375
• CPC Class Codes: G06F 21/77 in smart cards
• CPC Class Codes: G06F 21/79 in semiconductor storage media, e.g. directly-addressable memories

Abstract

An IC card used as a portable electronic device includes a CPU which performs various processes by executing control programs, a memory which stores data files, and a communicating portion which communicates with an external device. When receiving a command from the external device via the communicating portion, the CPU of the IC card determines whether or not a process corresponding to the command for the data string specified by the command received from the external device can be performed based on one of access conditions set for the respective data strings in the files stored in the memory and performs a command process when it is determined in the above determining process that the command process for the data string specified by the command can be performed.

Claims

1. A portable electronic device which is operated according to a command supplied from an external device, comprising:

a communicating portion which communicates with the external device,

a first storage portion which stores files into which a plurality of data strings are stored,

a second storage portion which stores access conditions set for respective data strings in the files stored in the first storage portion,

a determining portion which determines whether it is possible to perform a command process requested by a command for a data string specified by the command received from the external device via the communicating portion based on the access condition set for each data string stored in the second storage portion, and

a control portion which performs the command process when the determining portion determines that it is possible to perform the command process for the data string specified by the command.

2. The portable electronic device according to claim 1, wherein the first storage portion stores record files into which a plurality of records are stored as a plurality of data strings, and the second storage portion stores access conditions set for the respective records.

3. The portable electronic device according to claim 2, wherein the determining portion determines whether it is possible to perform a process requested by a command for a record specified by the command when the command which requests access to the record is received from the external device via the communicating portion.

4. The portable electronic device according to claim 3, wherein the command which requests access to the record is one of a READ RECORD command which requests a data read process for the specified record, a WRITE RECORD command which requests a data write process, an UPDATE RECORD command which requests a data update process and an APPEND RECORD command which requests a record appending process.

5. The portable electronic device according to claim 1, wherein the first storage portion stores a data object file into which a plurality of data objects having preset formats are stored as a plurality of data strings, and the second storage portion stores access conditions set for the respective data objects.

6. The portable electronic device according to claim 5, wherein the determining portion determines whether it is possible to perform a process requested by a command for a data object specified by the command when the command which requests access to the data object is received from the external device via the communicating portion.

7. The portable electronic device according to claim 6, wherein the command which requests access to the data object is one of a GET DATA command which requests a data read process for the specified data object and a PUT DATA command which requests a data write process.

8. The portable electronic device according to claim 1, wherein the second storage portion stores access conditions used to determine whether a possibility of access to each data string is provided according to a result of performance of a specified process.

9. The portable electronic device according to claim 8, wherein the result of performance of the specified process is one of a result of a verification process by a verification key and a result of an authentication process by an authentication key.

10. The portable electronic device according to claim 8, wherein the result of performance of the specified process is a result of a secure messaging process.

11. The portable electronic device according to claim 1, further comprising:

a module having the above portions, and

a main body which accommodates the module.

12. A control method used for a portable electronic device having a memory to store data and operated according to a command supplied from an external device, comprising:

determining whether it is possible to perform a command process requested by a command for a data string specified by the command received from the external device based on one of access conditions set for respective data strings of files stored in the memory when the command is received from the external device, and

performing the command process when it is determined in the determining process that it is possible to perform the command process requested by the command for the data string specified by the command.