KR20040058595A - A mobile communication terminal capable of certifying objects based on certification key, and method and apparatus for managing the certification key - Google Patents

Abstract

PURPOSE: A mobile communication terminal for authenticating a communication object through an authentication key, a management method of the authentication key and a device thereof are provided to authenticate a communication object received through an optional path, by using an authentication key built in a mobile communication terminal, and to receive/execute the authenticated communication object, thereby expanding a communication path of the communication object. CONSTITUTION: An authentication key distributive server(160) includes more than one processor(170) operated by an authentication key distributive software(180). The authentication key distributive software(180) includes a series of commands. The authentication key distributive server(160) has a data storage unit(190) that stores a currently used authentication key(155) and a new authentication key(195) for updating the authentication key(155). A mobile communication terminal(100) transceives a sound signal and/or data through a mobile communication network. The terminal comprises as follows. A memory(150) stores the authentication key(155). A processor(110) is operated by a terminal software(120) that manages the memory(150).

Description

A mobile communication terminal capable of authenticating a communication object through an authentication key, and a method and device for managing the authentication key.

The present invention relates to mobile communication, and more particularly, to a mobile communication terminal capable of authenticating a communication object through an authentication key, and a method and apparatus for managing the authentication key.

Conventionally, the function of a mobile communication terminal has been to provide only a voice call, but the functions of the mobile communication terminal have been diversified in recent years. For example, various types of content and application software can be downloaded and used from a server of a mobile communication company.

In addition, a function is added to enable a mobile internet connection, and various types of contents may be provided from various web servers through the wireless internet.

For these various functions, the mobile communication terminal includes operating system software to operate hardware in the terminal or to execute various application software by the operating system software.

By the way, the application software that can be downloaded and executed by the mobile communication terminal is typically operated to be limited to the application software transmitted from the server of the mobile communication company.

Unlike terminals based on computers such as a personal computer or a notebook, a mobile communication terminal is very limited in volume and performance, and thus requires strict management of stability.

However, when contents / application software that can be utilized by the mobile communication terminal is transmitted to the mobile communication terminal through a very limited path called a server of the mobile communication company, it is difficult to utilize various contents / application software.

However, if an application program is downloaded to a mobile communication terminal to communicate data with the mobile communication server at any time, the application program may be executed at an arbitrary path, thereby increasing the possibility of causing a communication failure between the mobile communication terminal and the mobile communication server.

Accordingly, the content / application software (hereinafter referred to as "communication object") transmitted to the mobile communication terminal is transmitted from the mobile communication company prior to transmission to the mobile communication terminal and / or execution in the mobile communication terminal. It is desirable that the approval be certified.

That is, for some types of communication objects, only a communication object determined to be safe by the mobile telecommunication company is assigned a code indicating its safety, and the mobile communication terminal checks whether the mobile communication terminal has been authenticated by the mobile communication company to identify the communication object. It is desirable to receive and / or execute.

By the way, in general, the authentication of a specific object can be found in a number of conventional Internet-related inventions. For example, authentication of a legitimate user in an online payment system (eg, internet banking). However, in this online authentication method / system, the objects of authentication were all limited to human beings. In other words, it is to check whether the person who wants to receive the online service is actually registered.

In this case, in order to perform a specific transaction with the server, it is inconvenient to authenticate every time the server is connected.

In addition, when it is necessary to change the authentication key for authentication, it is inconvenient to destroy the old authentication key and have to reissue a new authentication key from the server.

Accordingly, the present invention provides a mobile communication terminal that can conveniently authenticate a communication object in a mobile communication terminal, and can also conveniently manage an authentication key for authenticating a communication object, and a method and apparatus for managing an authentication key used therein. To provide.

1 is a block diagram of a communication object authentication key management system of a mobile communication terminal according to an embodiment of the present invention.

2 is a view showing that a communication object that can be safely used by a mobile communication terminal and a range of a transmission path thereof can be expanded according to an embodiment of the present invention, and FIG. 2A illustrates a situation according to the prior art, FIG. 2B. Shows a situation according to an embodiment of the present invention, respectively.

3 is a flowchart illustrating an authentication key management method according to an embodiment of the present invention.

4 is a flowchart illustrating a method for managing an authentication key according to another embodiment of the present invention.

In order to achieve the above object, a mobile communication terminal according to the present invention includes a memory storing an authentication key for authenticating a received communication object; And a processor operated by the set software for managing the memory, wherein the set software includes a series of instructions for managing the authentication key on the memory.

The set software may include: an update notification signal for notifying an update of the authentication key to a new authentication key and an update instruction reception step of receiving the new authentication key from a set authentication key distribution server; And a series of instructions for performing an authentication key updating step of storing the received new authentication key in the memory.

For example, in the update instruction receiving step, it is preferable to receive the update notification signal and the new authentication key through a multimedia message of the MMS.

The update instruction receiving step may further include receiving the update notification signal from the authentication key distribution server; Transmitting a transmission request signal for requesting transmission of the new authentication key to the authentication key distribution server in response to the update notification signal; And receiving the new authentication key from the authentication key distribution server. At this time, the update notification signal is preferably a text message of the SMS.

The set software includes: operating system software including a series of instructions for directly controlling the authentication key on the memory; And authentication key management software comprising a series of instructions for managing the authentication key using the operating system software.

At this time, the operating system software, receiving from the set authentication key distribution server an update notification signal for notifying the update of the authentication key to the new authentication key; Invoking the authentication key management software based on the received update notification signal; And a series of instructions for performing the step of receiving the new authentication key from the authentication key management software and storing it in the memory.

The authentication key management software may include: transmitting a signal requesting transmission of the new authentication key to the authentication key distribution server in response to an update notification signal from the operating system software; Receiving the new authentication key from the authentication key distribution server; And a series of instructions for performing the step of delivering the received new authentication key to the operating system.

The authentication key management method according to the present invention can be understood as being divided into the method performed by the mobile communication terminal of the present invention and the method performed by the authentication key management apparatus according to the present invention.

A method for managing an authentication key according to the present invention performed by a mobile communication terminal is a method for managing the authentication key of a mobile communication terminal that stores an authentication key for authenticating a received communication object. An update instruction reception step of receiving an update notification signal requesting an update and the new authentication key from a set authentication key distribution server; And an authentication key updating step of storing the received new authentication key.

In the update instruction receiving step, it is preferable to receive the update notification signal and the new authentication key through a MMS multimedia message.

The update instruction receiving step may further include receiving the update notification signal from the authentication key distribution server; Transmitting a transmission request signal for requesting transmission of the new authentication key to the authentication key distribution server in response to the update notification signal; And receiving the new authentication key from the authentication key distribution server. At this time, the update notification signal is preferably a SMS text message.

The authentication key management method according to the present invention performed by the authentication key management apparatus according to the present invention is a method for managing the authentication key of a mobile communication terminal having an authentication key for authenticating a received communication object. An update judging step of determining whether an update is required; And an update instructing step of transmitting an update notification signal for requesting the update to a new authentication key and the new authentication key to the mobile communication terminal, when the authentication key needs to be updated.

In the update instruction step, it is preferable to transmit the update notification signal and the new authentication key through a multimedia message of the MMS.

The update instructing step may include: when an update of the authentication key is required, transmitting an update notification signal for requesting an update to a new authentication key to the mobile communication terminal; Receiving a transmission request signal from the mobile communication terminal requesting transmission of the new authentication key in response to the update notification signal; And transmitting the new authentication key to the mobile communication terminal so as to be stored in the mobile communication terminal. At this time, the update notification signal is preferably a text message of the SMS.

An apparatus for managing an authentication key according to the present invention for implementing an authentication key management method according to the present invention includes: managing an authentication key of a mobile communication terminal that stores an authentication key and authenticates a communication object received using the authentication key. An apparatus, comprising: a data storage unit for storing the authentication key and a new authentication key; And a processor operated by a set software for managing the authentication key.

The set software, the update determination step of determining whether the update of the authentication key is necessary; And an update notification signal for requesting an update to a new authentication key and a series of instructions for performing an update instruction step of transmitting the new authentication key to the mobile communication terminal when an update of the authentication key is required.

In the update instruction step, it is preferable to transmit the update notification signal and the new authentication key through a multimedia message of the MMS.

The update instructing step may include: when an update of the authentication key is required, transmitting an update notification signal for requesting an update to a new authentication key to the mobile communication terminal; the new authentication key in response to the update notification signal. Receiving a transmission request signal from the mobile communication terminal requesting transmission of the data; And transmitting the new authentication key to the mobile communication terminal so as to be stored in the mobile communication terminal. At this time, the update notification signal is preferably a text message of the SMS.

The authentication key in the present invention as described above is preferably a public key of the public key cryptosystem.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a communication object authentication key management system of a mobile communication terminal according to an embodiment of the present invention.

As shown in FIG. 1, a communication object authentication key management system of a mobile communication terminal according to an embodiment of the present invention includes an authentication key distribution server 160 and a mobile communication terminal connected to the authentication key distribution server 160 by a mobile communication network. 100.

The authentication key distribution server 160 is a computer-based device, and includes one or more processors 170 operated by specific software 180 (hereinafter referred to as "authentication key distribution software" 180). Include. The authentication key distribution software 180 includes a series of instructions for performing each process performed by the authentication key distribution server 160 in the description of the authentication key management method of an embodiment of the present invention described below.

In addition, the authentication key distribution server 160 is provided with a data storage unit 190, the data storage unit 190, the authentication key 155 and the authentication key currently being used by the mobile communication terminal 100. A new authentication key 195 for updating 155 is stored.

The data storage unit 190 may be any data storage medium such as a hard disk, a memory semiconductor, or the like.

The mobile communication terminal 100 is any terminal capable of transmitting and receiving sound signals and / or data through the mobile communication network. The mobile communication terminal 100 may be embodied in various forms such as a mobile phone or an arbitrary terminal called a mobile phone, a personal digital assistant (PDA) having a function of transmitting and receiving data through the mobile communication network.

More specifically, the mobile communication terminal 100 includes a memory 150 for storing an authentication key 155 for authenticating a received communication object; And a processor 110 operated by software 120 (hereinafter referred to as "terminal software" 120) for managing the memory 150, wherein the terminal software 120 includes authentication on the memory. Contains a series of commands for managing keys.

The communication object may be any form such as content such as a web document of an Internet homepage, a script language embedded in the content, and application software that can be executed independently. In addition, the communication object is irrespective of its reception path such as the mobile communication network and the Internet.

The terminal software 120 includes a series of commands for performing each process performed by the mobile communication terminal 100 in the following description of the authentication key management method of the embodiment of the present invention.

However, the terminal software 120 includes: operating system software 140 including a series of instructions for directly controlling the authentication key 155 on the memory 150; And authentication key management software 120 including a series of instructions for managing the authentication key 155 using the operating system software 140, and FIG. 1 illustrates this preferred embodiment of the present invention. An example mobile communication terminal 100 is shown.

Conventional mobile communication terminals have operating system software for controlling the functions of the terminal itself. In order to implement the present invention, operating system software 140 according to an embodiment of the present invention may be implemented by modifying some of the commands included in the operating system software, and operated on the operating system software 140. This is because it is easy and convenient to manufacture the authentication key management software 120 for managing the authentication key as an application program.

The authentication key 155 does not necessarily need to be one. As a matter of course, a plurality or a plurality of authentication keys 155 may be set and used according to an embodiment of the present invention.

The authentication key 155 may be any key for the mobile communication terminal 100 to authenticate a communication object. However, in order to secure the authentication process and data used for authentication, the authentication key is preferably a public key in a cryptographic system collectively referred to as a public key cryptosystem. The authentication key 155 stored in the mobile communication terminal 100 can be easily confirmed through reverse engineering after a third party purchases the mobile communication terminal 100 in which the authentication key 155 is stored. This is because it is vulnerable to security.

Accordingly, the mobile communication terminal 100 more specifically, the terminal software 120 authenticates a communication object using the authentication key 155. A series of commands (hereinafter referred to as an "authentication program") necessary for the authentication process of the communication object may be included in any of the operating system software 140 and the authentication key management software 120, and some commands of the authentication program. May be included in the operating system software 140, and some other commands may be included in the authentication key management software, or may be a separate application program.

In this way, since the mobile communication terminal 100 has an authentication key 155 embedded therein and can authenticate a communication object by the authentication key 155, the communication object and the object thereof can be safely used by the mobile communication terminal 100. The range of transmission paths can be extended.

2 is a view showing that a communication object that can be safely used by a mobile communication terminal and a range of a transmission path thereof can be expanded according to an embodiment of the present invention, and FIG. 2A illustrates a situation according to the prior art, FIG. 2B. Shows a situation according to an embodiment of the present invention, respectively.

2 and the following description take an application as an example, but it is obvious that it can be applied to any other communication object.

As shown in FIG. 2A, when the application manufacturer 210 manufactures an application program, and the mobile communication company 220 reviews and approves the safety of the application program, the approved application program is transferred to the mobile communication server 225. And the mobile communication terminal 230 are distributed to the mobile communication terminal 230 through a mobile communication network. Accordingly, the mobile communication terminal 230 could receive the approved application program only through the mobile communication network and only through the mobile communication server 225.

However, according to the exemplary embodiment of the present invention as shown in FIG. 2B, when the mobile communication company 270 examines and approves an application produced by the application program maker 260, the mobile communication company 270 receives the approved application. The program is signed with a secret key and delivered to the application manufacturer 260. Therefore, from now on, the application program maker 260 may distribute the signed application program to the mobile communication terminal 100 through various networks such as the Internet using the server 265. However, the mobile communication company may also distribute the signed application to the mobile communication terminal 100 through the server 275 through the mobile communication network.

However, the mobile telecommunication company 270 is provided with an authentication key distribution server 160 for management, such as updating the authentication key 155 stored in the mobile communication terminal 100, the authentication key distribution server 160 Through the authentication key 155 of the mobile communication terminal 100 is managed.

In FIG. 2, the authentication key distribution server 160 is illustrated as a separate server from the mobile communication company server 275 distributing an application program, but for convenience of description, the authentication key distribution server 160 is illustrated. It will be apparent to those skilled in the art that the mobile communication company server 275 and one server or both are implemented as separate servers.

Hereinafter, an authentication key management method according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

As shown in FIG. 3, first, the authentication key distribution software 180 of the authentication key distribution server 160 determines whether an update of the authentication key 155 is necessary (S305).

Whether the authentication key 155 needs to be updated may be determined by an arbitrarily set decision criterion by a person skilled in the art to manage the authentication key 155 according to an embodiment of the present invention. For example, when a new authentication key is produced, it may be necessary to update the authentication key 155.

When the update of the authentication key 155 is required, the authentication key distribution software 180 transmits an update notification signal notifying that the authentication key needs to be updated to the mobile communication terminal 100 through the wireless communication network (S310).

The reception of the update notification signal from the mobile communication terminal 100 is detected by the operating system software 140, and the operating system software 140 needs to update the authentication key 155 from the update notification signal. Recognize (S320).

The update notification signal may be any signal that can be transmitted and received through a wireless communication network, any specific code specifying an authentication key to be updated (hereinafter referred to as " old authentication key "), and update of the old authentication key. Contains any specific code that means this is necessary. Hereinafter, the old authentication key refers to the authentication key 155 currently being used by the mobile communication terminal 100, and the authentication key management method according to the embodiment of the present invention with reference to the situation of updating the authentication key 155. Explain.

For example, the update notification signal may be transmitted in the form of a text message of SMS (Short Message Service). In this case, the text message of the update notification signal includes a specific string, and the operating system software can check whether the authentication key 155 needs to be updated based on whether the specific string is included in the received text message.

When the update of the authentication key 155 is required, the operating system software 140 calls the authentication key management software 120 (S325).

The called authentication key management software 120 transmits a transmission request signal for transmitting the new authentication key 195 to the authentication key distribution server 160 through the wireless communication network (S330). The transmission request signal may be any signal that can be transmitted and received through a wireless communication network, any specific code specifying the old authentication key 155, and a new authentication key 195 for the old authentication key 155. Contains any specific code that requires the transmission of

The transmission request signal received from the authentication key distribution server 160 is detected by the authentication key distribution software 180 (S340), so that the authentication key distribution software 180 sends a new authentication key 195 to the mobile communication terminal ( 100) (S345).

Accordingly, the authentication key management software 120 receives a new authentication key 195 (S350). The old authentication key 155 is updated with the new authentication key 195 by transmitting a signal for requesting the old authentication key 155 to be updated with the new authentication key 195 and the new authentication key 195 to the operating system. Request to do (S355).

The operating system software 140 receives the update request (S355) (S360), thereby replacing the old authentication key 155 stored in the memory 150 with a new authentication key 195 authentication key 155 Update (S365).

By such processes, if it is determined that the authentication key needs to be renewed by the mobile communication company, the authentication key may be automatically updated at any time without causing inconvenience to the user.

In the embodiment of the authentication key management method of the present invention described above with reference to FIG. 3 when the authentication key update notification signal is transmitted from the authentication key distribution server 160 to the mobile communication terminal 100, the mobile communication terminal 100 In the request for a new authentication key 195 to the authentication key distribution server 160, and stores the new authentication key 195 received accordingly.

By the way, the message that can be transmitted from the server (275, 160) of the mobile communication company to the mobile communication terminal (), as the function of the mobile communication terminal is diversified in the form of possible messages, for example, not only text, but also pictures It is now possible to send embedded messages (hereafter referred to as multimedia messages) that include attached files such as files and video files. A service for transmitting these various types of messages is commonly referred to as MMS (Multimedia Messaging Service).

Therefore, the management of the authentication key can be made more efficient by using the MMS. Hereinafter, the authentication key management method of the embodiment of the present invention for managing the authentication key using the MMS will be described in detail with reference to FIG. .

As shown in FIG. 4, first, the authentication key distribution software 180 of the authentication key distribution server 160 determines whether an update of the authentication key 155 is necessary (S405).

Whether the authentication key 155 needs to be updated may be determined by an arbitrarily set decision criterion by a person skilled in the art to manage the authentication key 155 according to an embodiment of the present invention. For example, when a new authentication key is produced, it may be necessary to update the authentication key 155.

When the update of the authentication key 155 is required, the authentication key distribution software 180 transmits an update instruction signal for instructing the update of the authentication key to the new authentication key 195 to the mobile communication terminal 100 via the wireless communication network ( S410).

At this time, the update instruction signal is a multimedia message of the MMS. The multimedia message includes an update notification signal for requesting an update to a new authentication key 195, and the new authentication key is attached. The update notification signal includes a specific string, and the operating system software may check whether the authentication key 155 needs to be updated based on whether the specific string is included in the received multimedia message.

The reception of the update instruction signal in the mobile communication terminal 100 is detected by the operating system software 140 (S415), and the operating system software 140 receives the updated multimedia message from the authentication key 155. Check whether it is a message indicating (S420). The confirmation process (S420) may be confirmed whether the update notification signal is included in the received multimedia message.

If the received multimedia message is a message instructing to update the authentication key 155, the operating system software 140 replaces the old authentication key 155 stored in the memory 150 with a new authentication key 195. The authentication key 155 is updated (S425).

As mentioned above, although preferred embodiments of the method and apparatus for managing a mobile communication terminal and an authentication key of the present invention have been described, the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments. Any change in the scope deemed to be equivalent and readily changed by a person with knowledge of the subject matter shall be included.

According to an embodiment of the present invention, since a mobile communication terminal can receive / execute a communication object (content, application program, etc.) received through an arbitrary path using an authentication key built in the mobile communication terminal, the mobile communication terminal The communication path of the communication object that can be used after authentication is expanded. Accordingly, the mobile communication terminal can receive the approved communication object through various paths.

In addition, by using the authentication key as the public key of the public key cryptosystem, it is possible to improve the security of the authentication process and data required for the communication object.

In addition, the authentication key is always updated when necessary. Therefore, since the mobile communication terminal always embeds the latest authentication key, the mobile communication terminal can immediately authenticate the communication object signed by the new secret key.

In addition, a series of commands for managing the authentication key is written in the operating system software and a separate application program and implemented in the mobile communication terminal, so that it can be easily utilized in the structure of the existing mobile communication terminal.

By using a specific string included in the SMS text message as a signal notifying that the authentication key of the mobile terminal needs to be renewed, the mobile terminal does not have to be changed in the structure of the mobile terminal and without any significant change in the function of the server of the mobile communication terminal. Easy implementation is possible. In addition, the user of the mobile communication terminal can easily confirm later that the authentication key has been updated based on the string.

In addition, when the MMS multimedia message is used to update the authentication key, the communication load between the mobile communication terminal and the authentication key distribution server can be reduced. Therefore, the authentication key can be immediately updated after the update instruction.

Claims (23)

A memory storing an authentication key for authenticating a received communication object; And A processor operated by the set software for managing the memory, And the set software includes a series of instructions for managing an authentication key on the memory. In claim 1, The set software is, An update instruction receiving step of receiving an update notification signal for notifying update of the authentication key to a new authentication key and the new authentication key from a set authentication key distribution server; And And a series of instructions for performing an authentication key updating step of storing the received new authentication key in the memory. In claim 2, The update instruction receiving step is a mobile communication terminal, characterized in that for receiving the update notification signal and the new authentication key via a multimedia message of the MMS. In claim 2, The update instruction receiving step, Receiving the update notification signal from the authentication key distribution server; Transmitting a transmission request signal for requesting transmission of the new authentication key to the authentication key distribution server in response to the update notification signal; And And receiving the new authentication key from the authentication key distribution server. In claim 1, The set software is, Operating system software including a series of instructions for directly controlling the authentication key on the memory; And And authentication key management software comprising a series of instructions for managing the authentication key using the operating system software. In claim 5, The operating system software, Receiving from the set authentication key distribution server an update notification signal for notifying update of the authentication key to a new authentication key; Invoking the authentication key management software based on the received update notification signal; And A series of instructions for performing the step of receiving the new authentication key from the authentication key management software and storing it in the memory, The authentication key management software, Transmitting a signal requesting transmission of the new authentication key to the authentication key distribution server in response to an update notification signal from the operating system software; Receiving the new authentication key from the authentication key distribution server; And And a series of instructions for performing the step of delivering the received new authentication key to the operating system. In any one of claims 1 to 6, And the authentication key is a public key of a public key cryptosystem. In any one of claims 4 to 6, The update notification signal is a mobile communication terminal, characterized in that a text message of the SMS. A method of managing the authentication key of a mobile communication terminal for storing an authentication key for authenticating a received communication object, An update instruction receiving step of receiving an update notification signal for requesting an update of the authentication key to a new authentication key and the new authentication key from a set authentication key distribution server; And Authentication key management method stored in the mobile communication terminal comprising the authentication key updating step of storing the received new authentication key. In claim 9, The update instruction receiving step is an authentication key management method stored in the mobile communication terminal, characterized in that for receiving the update notification signal and the new authentication key via a multimedia message of the MMS. In claim 9, The update instruction receiving step, Receiving the update notification signal from the authentication key distribution server; Transmitting a transmission request signal for requesting transmission of the new authentication key to the authentication key distribution server in response to the update notification signal; And And receiving the new authentication key from the authentication key distribution server. The method according to any one of claims 9 to 11, The authentication key is stored in a mobile communication terminal, characterized in that the public key encryption key public key management method. In claim 11, The update notification signal is an authentication key management method stored in the mobile communication terminal, characterized in that a text message of the SMS. A method of managing the authentication key of a mobile communication terminal having a built-in authentication key for authenticating a received communication object, An update determining step of determining whether the authentication key needs to be updated; And An update notification signal for requesting an update to a new authentication key and an update instructing step of transmitting the new authentication key to the mobile communication terminal when an update of the authentication key is required. The method of claim 14, The update instructing step is an authentication key management method stored in the mobile communication terminal, characterized in that for transmitting the update notification signal and the new authentication key via a multimedia message of the MMS. The method of claim 14, The update instruction step, When an update of the authentication key is necessary, transmitting an update notification signal for requesting an update to a new authentication key to the mobile communication terminal; Receiving a transmission request signal from the mobile communication terminal requesting transmission of the new authentication key in response to the update notification signal; And And transmitting the new authentication key to the mobile communication terminal so as to be stored in the mobile communication terminal. The method according to any one of claims 14 to 16, And the authentication key is a public key of a public key cryptographic system. The method of claim 16, The update notification signal is an authentication key management method stored in the mobile communication terminal, characterized in that a text message of the SMS. An apparatus for storing an authentication key and managing the authentication key of a mobile communication terminal for authenticating a received communication object using the authentication key. A data storage unit for storing the authentication key and the new authentication key; And Including a processor that is operated by the set software for managing the authentication key, The software set above is An update determining step of determining whether the authentication key needs to be updated; And A mobile communication terminal including an update notification signal for requesting an update to a new authentication key and a series of instructions for transmitting the new authentication key to the mobile communication terminal when an update of the authentication key is necessary; Authentication key management device stored in. The method of claim 19, The update instructing step is an authentication key management device stored in a mobile communication terminal, characterized in that for transmitting the update notification signal and the new authentication key via a multimedia message of the MMS. The method of claim 19, The update instruction step, When an update of the authentication key is necessary, transmitting an update notification signal for requesting an update to a new authentication key to the mobile communication terminal; Receiving a transmission request signal from the mobile communication terminal requesting transmission of the new authentication key in response to the update notification signal; And And transmitting the new authentication key to the mobile communication terminal so as to be stored in the mobile communication terminal. The method of any of claims 19 to 21, And the authentication key is a public key of a public key cryptographic system. The method of claim 21, The update notification signal is an authentication key management device stored in a mobile communication terminal, characterized in that a text message of the SMS.