Mobile communication terminal

• US 20070203839A1
• Filed: 04/18/2006
• Published: 08/30/2007
• Est. Priority Date: 04/18/2005
• Status: Active Grant

• Current Assignee: Fujitsu Mobile Communications Limited (Fujitsu Limited)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Sato, Jun, Watanabe, Keiko, Terauchi, Toru
• Granted Patent: US 7,685,071 B2
• Time in Patent Office: Days
• US Class Current: 705/51
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 2209/80 Wireless
• CPC Class Codes: H04L 9/0872 using geo-location information, e.g. location data, time, relative position or proximity to other entities
• CPC Class Codes: H04M 2250/64 file transfer between terminals

Abstract

A mobile communication terminal moves and backs up a content, which was downloaded from a content server, to a personal computer. When the mobile communication terminal receives an encryption key generation request from the personal computer via a cable, the mobile communication terminal extracts information to be used for generating the encryption key and generates the encryption key by using the extracted information and own telephone number. And the generated encryption key is transmitted to the personal computer via the cable. Accordingly, the backed up and moved content can be reproduced with the personal computer.

Claims

1. A mobile communication terminal comprising:

downloading means for downloading a content from a content server;

encrypting means for encrypting a content with an encryption key and generating an encrypted content;

a first memory configured to store first information inherent to the mobile communication terminal;

a second memory configured to store the encrypted content and a download time which is added to the content when the downloading means downloads the content;

content moving means for moving the encrypted content and the download time stored in the second memory to an external device;

key generating means for generating the encryption key by using the download time and the first information;

control means, if a key generation request which includes the download time is received, for extracting the download time from the request and for making the key generating means generate the encryption key by using the extracted download time and the first information stored in the first memory; and

transmitting means for transmitting the encryption key generated by the key generating means to the external device.

2. The mobile communication terminal according to claim 1, wherein the first information is a telephone number of the mobile communication terminal.

5. The mobile communication terminal according to claim 1, further comprising:

session control means for establishing a secure session with the external device in case of transmitting the encryption key to the external device.

3. A mobile communication terminal comprising:

downloading means for downloading a content from a content server;

encrypting means for encrypting a content with a first encryption key and generating an encrypted content, and for encrypting the first encryption key and generating a encrypted first key;

a first memory configured to store first information inherent to the mobile communication terminal;

a second memory configured to store the encrypted content, the encrypted first encryption key, and a download time which is added to the content when the downloading means downloads the content;

content moving means for moving the encrypted content, the encrypted first encryption key, and the download time stored in the second memory to an external device;

key generating means for generating the first encryption key from a random number,and the second encryption key by using the download time and the first information;

control means, if a key generation request which includes the download time is received, for extracting the download time from the request and for making the key generating means generate the second encryption key by using the extracted download time and the first information stored in the first memory; and

transmitting means for transmitting the second encryption key generated by the key generating means to the external device.

4. The mobile communication terminal according to claim 3, wherein the first information is a telephone number of the mobile communication terminal.

6. The mobile communication terminal according to claim 3, further comprising:

Session control means for establishing a secure session with the external device in case of transmitting the second encryption key to the external device.

7. A mobile communication terminal comprising:

an interface configured to receive a content from a external device;

a first memory configured to store first information inherent to the mobile communication terminal;

key generating means for generating a first encryption key by using the first information and a second encryption key by using a second information transmitted from a second mobile communication terminal;

encrypting means for encrypting the received content with the first encryption key and outputting a first encrypted content;

a second memory configured to store the first encrypted content;

re-encrypting means, if content moving request to the second communication terminal is inputted, for decrypting the first encrypted content with the first encryption key, encrypting the decrypted first encrypted content with the second encryption key, and outputting a second encrypted content; and

transmitting means for transmitting the second encrypted content to the second communication terminal.

8. The mobile communication terminal according to claim 7, wherein the first information is terminal identification number of the mobile communication terminal.

9. The mobile communication terminal according to claim 8, wherein the second information is a telephone number of the second communication terminal.