System and method for controlling a mobile terminal using a digital signature

• US 7,272,383 B2
• Filed: 07/14/2004
• Issued: 09/18/2007
• Est. Priority Date: 08/12/2003
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jung, Kyung-im
• Primary Examiner(s): Feild; Joseph
• Assistant Examiner(s): AJIBADE AKONAI, OLUMIDE
• Application Number:
  US10/890,209
• Publication Number:
  US 20050037736A1
• Time in Patent Office: 1,161 Days
• Field of Search: 455/410, 455/411, 455/418, 455/419, 455/420, 455/414.1, 455/527, 455/528, 455/466, 380/247, 380/248, 380/249, 380/250, 380/270, 380/283, 380/255, 713/168, 713/169, 713/170, 713/171, 713/176, 713/180
• US Class Current: 455/411
• CPC Class Codes: G06F 21/305 by remotely controlling device operation
• CPC Class Codes: G06F 21/6209 to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
• CPC Class Codes: G06F 21/74 operating in dual or compartmented mode, i.e. at least one secure mode
• CPC Class Codes: G06F 21/88 Detecting or preventing theft or loss
• CPC Class Codes: G06F 2221/2105 Dual mode as a secondary aspect
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 20/10425 by counting out-of-lock events of a PLL
• CPC Class Codes: G11B 20/22 for reducing distortions
• CPC Class Codes: H03L 7/091 the phase or frequency detector using a sampling device H03L7/087 takes precedence
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/2903 Methods and arrangements specifically for encoding, e.g. parallel encoding of a plurality of constituent codes
• CPC Class Codes: H03M 13/2993 Implementing the return to a predetermined state, i.e. trellis termination
• CPC Class Codes: H03M 13/6356 by repetition or insertion of dummy data, i.e. rate reduction
• CPC Class Codes: H03M 13/6362 by puncturing
• CPC Class Codes: H03M 7/4006 Conversion to or from arithmetic code
• CPC Class Codes: H04B 10/25754 Star network topology
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/0068 : by puncturing
• CPC Class Codes: H04L 25/03038 : with a non-recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/497 : by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems transversal equalizers at the transmitter end H04L25/03343
• CPC Class Codes: H04L 51/04 : Real-time or near real-time messaging, e.g. instant messaging [IM]
• CPC Class Codes: H04L 51/48 : Message addressing, e.g. address format or anonymous messages, aliases
• CPC Class Codes: H04L 51/58 : Message adaptation for wireless communication
• CPC Class Codes: H04L 63/126 : the source of the received data
• CPC Class Codes: H04L 65/1016 : IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1104 : Session initiation protocol [SIP]
• CPC Class Codes: H04N 19/109 : among a plurality of temporal predictive coding modes
• CPC Class Codes: H04N 19/139 : Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/625 : using discrete cosine transform [DCT]
• CPC Class Codes: H04N 19/91 : Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
• CPC Class Codes: H04W 12/082 : using revocation of authorisation
• CPC Class Codes: H04W 12/10 : Integrity
• CPC Class Codes: H04W 4/12 : Messaging; Mailboxes; Announcements
• CPC Class Codes: H04W 4/14 : Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
• CPC Class Codes: H04W 52/30 : using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/12 : Setup of transport tunnels
• CPC Class Codes: H04W 8/245 : from a network towards a terminal
• CPC Class Codes: H04W 8/26 : Network addressing or numbering for mobility support
• CPC Class Codes: H04W 88/085 : Access point devices with remote components
• CPC Class Codes: Y10S 370/906 : Fiber data distribution interface, FDDI
• CPC Class Codes: Y10S 370/907 : Synchronous optical network, SONET

Abstract

A mobile terminal control system using a digital signature. The system including a server for preparing a command message for a relevant mobile terminal according to mobile terminal status information set by a user, adding a digital signature to the prepared command message, and transmitting the resultant message. The system further includes a mobile terminal for authenticating the command message transmitted from the server and performing operations of power-off, log-on and log-off of the mobile terminal according to the authenticated command message. The server prepares a command message according to mobile terminal status information set by a user and transmits the prepared command message to a mobile terminal and the mobile terminal authenticates the transmitted command message. The mobile terminal can be controlled only through the authenticated message.

Claims

1. A server used to control a mobile terminal, wherein a command message is prepared by the server for the mobile terminal according to mobile terminal status information set by a user, in response to the mobile terminal requesting the server to send a log-on message, the command message is transmitted to the mobile terminal after a digital signature is added to the command message by the server,

wherein the command message permits the mobile phone to be logged on if the status information set by the user is a log-on approval status, and prevents the mobile phone from being logged on if the status information set by the user is a log-on disapproval status.

2. The server as claimed in claim 1, wherein the command message comprises, an operation command and the digital signature for the mobile terminal, a unique number corresponding to the mobile terminal, and a sequence number.

3. The server as claimed in claim 1, comprising:

a database unit operable to store mobile terminal information and the mobile terminal status information set by the user;

a first authentication unit operable to authenticate the mobile terminal; and

a first control unit operable to prepare the command message according to the mobile terminal status information set by the user and further operable to transmit the prepared command message.

4. A mobile terminal operable to receive a command message transmitted from a server in response to the mobile terminal requesting the server to send a log-on message, wherein the command message is authenticated by the mobile terminal, and operations of the mobile terminal, including power-off, log-on and log-off, are performed according to the authenticated command message.

5. The mobile terminal as claimed in claim 4, wherein the command message comprises an operation command for the mobile terminal, a unique number corresponding to the mobile terminal, and a digital signature for the authentication.

6. The mobile terminal as claimed in claim 4, comprising:

an authentication unit operable to authenticate the command message transmitted from the server; and

a control unit operable to request the server to send a log-on message thereto and control the operations of power-off, log-on and log-off of the mobile terminal according to the command message transmitted from the server.

7. A mobile terminal control system using a digital signature, the mobile terminal comprising:

a server operable to prepare a command message corresponding to a mobile terminal according to mobile terminal status information set by a user, add a digital signature to the prepared command message, and transmit the resultant message in response to the mobile terminal requesting the server to send a log-on message; and

a mobile terminal operable to receive and authenticate the command message transmitted from the server and perform operations including power-off, log-on and log-off in regard to the mobile terminal according to the authenticated command message.

8. A method of controlling a mobile terminal using a digital signature, the method comprising:

setting, by a user, a status of the mobile terminal;

receiving a log-on request message from the mobile terminal;

preparing a log-on approval message if the status of the mobile terminal, is a log-on approved status;

preparing a log-on disapproval message if the status of the mobile terminal is a log-on disapproved status; and

transmitting the prepared message to the mobile terminal.

9. The method as claimed in claim 8, wherein the log-on approval or log-on disapproval message includes an operation command for the mobile terminal, a unique number of the mobile terminal, and a digital signature for authentication.

10. A method of controlling a mobile terminal using a digital signature, the method comprising:

requesting a server to send a log-on message when the mobile terminal is powered on;

receiving a command message prepared in accordance with mobile terminal status information set by a user in the server;

authenticating the received command message; and

after completing the authentication of the command message, causing the mobile terminal to be logged on if the command message contains log-on approval, or not to be logged on if the command message contains log-on disapproval.

11. The method as claimed in claim 10, wherein the requesting the log-on message is performed when the mobile terminal is set to be in a secure log-on mode.

12. The method as claimed in claim 11, wherein the setting of the secure log-on mode comprises:

receiving a power-off message prepared by the server in accordance with a power-off request from the user;

authenticating the power-off message received from the server;

cutting off power supplied to the mobile terminal when the authentication of the command message is completed; and

setting a mode of the mobile terminal to the secure log-on mode when the mobile terminal is powered off.

13. The method as claimed in claim 12, wherein the cutting off of the power supplied to the mobile terminal when the authentication of the command message is completed further comprises transmitting a power-off completion message to the server when the mobile terminal is powered off.

14. The method as claimed in claim 10, wherein the command message comprises an operation command for the mobile terminal, a unique number of the mobile terminal, and a digital signature for the authentication.