KR101487583B1 - Mobile instant messaging service method using personal computer - Google Patents

Abstract

An instant messaging service method of a mobile terminal that relays a message between a personal computer and an instant message server is disclosed. A mobile terminal according to an exemplary embodiment may transmit a message received from an instant message server to a previously authenticated personal computer, and may transmit a message received from a previously authenticated personal computer to an instant message server.

Description

TECHNICAL FIELD [0001] The present invention relates to a mobile instant messaging service method using a personal computer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile instant messaging service method using a personal computer, and more particularly, to a method of instant messaging service of a mobile terminal that relays a message between a personal computer and an instant message server.

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Techniques to be the background of the present invention are described in the following documents.
1) Korea Patent Publication No. 2007-0042130
2) Korean Published Patent Application No. 2007-0044728
3) Korea Patent Publication No. 2005-0037033
An instant messaging service is a service that supports two or more immediate (real-time) text communications using a network such as the Internet. Instant Messenger is a client that relays instant messages. An instant messaging service differs from an e-mail service in that a conversation takes place in real time. Every time a conversation person types in a line, the transmission takes place, so this is similar to talking a phone conversation rather than exchanging letters.
The mobile instant messaging service is an instant messaging service provided through a mobile terminal such as a smart phone. Recently, as the number of users of mobile instant messaging service has surged, demand for receiving a mobile instant messaging service on a personal computer is increasing.

An instant messaging service method of a mobile terminal according to one side comprises: receiving a received message from an instant message server; Transmitting the received message to a personal computer (PC) previously authenticated in response to receiving the received message; Receiving a transfer message from the pre-authenticated personal computer; And transmitting the transmission message to the instant message server in response to receiving the transmission message.

At this time, the instant messaging service method of the mobile terminal may include authenticating the personal computer using a first key shared between the instant message server, the mobile terminal, and the personal computer. Generating a second key different from the first key when the authentication is successfully performed; And sharing the second key between the mobile terminal and the personal computer.

The instant messaging service method of the mobile terminal may further include encrypting the received message using the second key. In the step of transmitting the received message, the received message includes the encrypted received message .

The instant messaging service method of the mobile terminal may further include decrypting the transmission message using the second key, and in the step of receiving the transmission message, the transmission message is encrypted using the second key, Lt; / RTI > message.

In addition, the instant messaging service method of the mobile terminal may include receiving a connection status confirmation signal transmitted from the pre-authenticated personal computer at predetermined intervals; And maintaining a connection with the previously authenticated personal computer when the connection status confirmation signal is received.

The instant messaging service method of the mobile terminal may further include transmitting a reconnection state reconfirmation signal to the pre-authenticated personal computer when a connection state confirmation signal transmitted from the previously authenticated personal computer is not received, ; And terminating the connection with the previously authenticated personal computer if a response signal to the connection status re-confirmation signal is not received from the previously authenticated personal computer.

The instant messaging service method of the mobile terminal may further include receiving a request signal of the mobile terminal related information from the instant message server; And transmitting a response signal including the mobile terminal related information to the instant message server in response to the receipt of the request signal, wherein the instant message server further comprises: And transmit the mobile terminal related information to the previously authenticated personal computer in response to receiving the response signal.

The instant messaging service method of the mobile terminal may further include transmitting the chat history to the personal computer when the authentication is successfully performed. The chat history may include a list of participating chat rooms, And conversation history.

The instant messaging service method of the mobile terminal may further include: determining whether the pre-authenticated personal computer exists; Or confirming the connection status with the previously authenticated personal computer, wherein the step of transmitting the received message further comprises determining whether to transmit the received message according to at least one of the determination result or the confirmation result Based on the result of the determination.

A method of operating a personal computer (PC) interworking with a mobile terminal for an instant messaging service according to another party includes: receiving a received message from the mobile terminal; Displaying the received message in response to the receiving; Providing an interface for receiving a transmission message; And transmitting the transmission message to the mobile terminal in response to the input via the interface.

In this case, the method of operating the personal computer may include: requesting authentication to the mobile terminal using a first key shared between the instant message server, the mobile terminal, and the personal computer; And receiving a second key different from the first key from the mobile terminal, wherein the mobile terminal can generate the second key when the authentication is successfully performed.

The method further includes decrypting the received message using the second key. In the step of receiving the received message, the received message is encrypted and received using the second key And in the step of displaying the received message, the received message may include the decoded received message.

The method of operation of the personal computer may further include encrypting the transmission message using the second key. In the transmission of the transmission message, the transmission message may include an encrypted transmission message.

The method of operating the personal computer may further include transmitting a connection status confirmation signal to the mobile terminal at predetermined intervals or in response to the request of the mobile terminal. And receiving a connection maintaining signal including an IP of the mobile terminal from the mobile terminal.

According to another aspect of the present invention, there is provided a method of operating a personal computer, the method comprising: requesting an instant message server for information related to the mobile terminal when the connection maintaining signal is not received from the mobile terminal; And receiving the mobile terminal related information from the instant message server, wherein the instant message server can obtain the mobile terminal related information from the mobile terminal in response to the request.

1 illustrates a system for providing an instant messaging service according to an embodiment;
2 is a flowchart illustrating an instant messaging service method and an operation method of a personal computer according to an exemplary embodiment of the present invention.
3 is a flowchart illustrating an authentication method of a personal computer using a first key and a method of encrypting / decrypting a message using a second key according to an exemplary embodiment.
4 is a diagram for explaining a connection status confirmation method between a mobile terminal and a personal computer according to an exemplary embodiment;
FIG. 5 is a diagram illustrating a method for a personal computer according to an embodiment to request an IP address of a mobile terminal to an instant message server; FIG.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a system for providing an instant messaging service according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a system for providing an instant messaging service according to an embodiment includes an instant message server 130, a mobile terminal 110, and a personal computer 120. Hereinafter, the instant messaging service may include a mobile instant messaging service. The personal computer 120 may be an apparatus for providing an instant messaging service in a wired or wireless connection with the mobile terminal 110, for example, a desktop computer, a laptop computer, a tablet computer, or the like.

Here, the mobile terminal 110 may communicate with the instant message server 130 to provide an instant messaging service. More specifically, the mobile terminal 110 may provide an instant messaging service using an instant messaging application operatively associated with the instant messaging server 130.

The instant message server 130 may transmit a message transmitted from the mobile terminal 110 to another user and may transmit a message received from another user to the mobile terminal 100.

At this time, when the user of the mobile terminal 110 is using the personal computer 120 (for example, when the user is surfing the Internet using a PC at home or viewing a business using a PC in the office) , And may wish to receive an instant messaging service through the personal computer 120 rather than the mobile terminal 110.

In this case, the mobile terminal 110 may transmit an instant message between the instant message server 130 and the personal computer 120. For example, the mobile terminal 110 may serve as a proxy server for relaying between the instant message server 130 and the personal computer 120.

More specifically, the message transmitted by the instant message server 130 is transmitted to the personal computer 120 via the mobile terminal 110, and the message transmitted by the personal computer 120 is also transmitted through the mobile terminal 110 And is transmitted to the instant message server 130.

As described above, by excluding the direct communication between the instant message server 130 and the personal computer 120 and adopting the message exchange method through the mobile terminal 110, the instant messaging service method according to one embodiment can reduce the number of communication and enhance security And so on.

For example, when the instant message server directly communicates with the personal computer, the instant message server must send a message to both the personal computer and the mobile terminal. Meanwhile, the instant message server 130 according to an exemplary embodiment may transmit a message only to the mobile terminal 110 regardless of whether the user wants to receive the instant messaging service using the personal computer 120. [ Accordingly, the number of communications of the instant message server 130 can be reduced.

In addition, since the instant messaging service method according to the embodiment performs communication based on the authentication of the personal computer 120 as will be described in detail below, security can be enhanced as compared with the existing password input method.

For example, an instant messaging service method according to one embodiment may use the first key shared between the instant message server 130, the mobile terminal 110 and the personal computer 120 to authenticate the personal computer 120 If successful, the second key may be shared between the personal computer 120 and the mobile terminal 110. The personal computer 120 and the mobile terminal 110 can encrypt / decrypt messages exchanged using the second key, respectively.

2 is a flowchart illustrating an instant messaging service method and an operation method of a personal computer according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a mobile terminal 210 according to an exemplary embodiment may receive a received message from an instant message server 230 (211). Here, the received message may include an instant message transmitted from another user to the user of the mobile terminal 210.

The mobile terminal 210 may transmit the received message to the personal computer 220 in response to receiving the received message (212). Here, it is assumed that the personal computer 220 has been successfully authenticated by the mobile terminal 210 in advance. The authentication process between the mobile terminal 210 and the personal computer 220 will be described in detail below. Hereinafter, the personal computer 220 may include a personal computer previously authenticated by the mobile terminal 210. [

The personal computer 220 may receive the received message from the mobile terminal 210 (221). The personal computer 220 may display the received message in response to receiving the received message (222).

In addition, the personal computer 220 may provide an interface for receiving a transmission message (223). When the user inputs a transmission message using the interface, the personal computer 220 may transmit the transmission message to the mobile terminal 210 in response to the input (224).

The mobile terminal 210 may receive a transmission message 213 from the personal computer 220 and may transmit the transmission message 214 to the instant message server 230 in response to receiving the transmission message.

Although not shown in the drawing, the mobile terminal 210 according to another embodiment may access the personal computer 220 using the first key shared between the instant message server 230, the mobile terminal 210 and the personal computer 220, Can be authenticated.

Here, the method in which the first key is shared between the instant message server 230, the mobile terminal 210, and the personal computer 220 may be variously implemented.

For example, the personal computer 220 may transmit a signal requesting interworking with the mobile terminal 210 to the instant message server 230. The instant message server 230 may generate the first key in response to the interlock request signal of the personal computer 220 and may share the generated first key with the mobile terminal 210 and the personal computer 220.

The mobile terminal 210 can exchange necessary information with the instant message server 230 in order to authenticate the personal computer 220 using the first key.

For example, the personal computer 220 can receive the password of the instant message application installed in the mobile terminal 210 from the user. The personal computer 220 may encrypt the password input using the first key, and then transmit the encrypted information to the mobile terminal 210. The mobile terminal 210 can extract the password by decrypting the encrypted information using the first key. Further, the mobile terminal 210 may transmit a signal to the instant message server 230 to confirm whether the extracted password is a correct password.

The mobile terminal 210 may generate a second key different from the first key when authentication of the personal computer 220 using the first key is successfully performed. The mobile terminal 210 may share the generated second key with the personal computer 220.

The mobile terminal 210 and the personal computer 220 can encrypt or decrypt messages mutually transmitted and received using the shared second key.

For example, the mobile terminal 210 may encrypt the received message received from the instant message server 230 using the second key. In this case, the mobile terminal 210 can transmit the encrypted received message to the personal computer 220 using the second key.

The personal computer 220 can decrypt the encrypted received message using the second key when receiving the encrypted received message. In addition, the personal computer 220 can encrypt the transmission message input through the interface using the second key. In this case, the personal computer 220 can transmit the encrypted transmission message to the mobile terminal 210 using the second key. When the mobile terminal 210 receives the encrypted transmission message, the mobile terminal 210 may decrypt the encrypted transmission message using the second key, and then transmit the decrypted transmission message to the instant message server 230.

The mobile terminal according to another embodiment may determine whether or not a previously authenticated personal computer exists. In addition, the mobile terminal can check the connection status with the personal computer according to the determination that the personal computer is authenticated in advance. In this case, the mobile terminal can make a decision to transmit the received message to the personal computer in accordance with the determination that the personal computer is authenticated and connected to the personal computer.

3 is a flowchart illustrating an authentication method of a personal computer using a first key and a method of encrypting / decrypting a message using a second key according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a personal computer according to an embodiment may request downloading of a client for a personal computer to an instant message server (311). The instant messaging server may provide the corresponding client to the personal computer in response to the download request (312).

The personal computer may then send a first authentication request signal to the instant message server (313). At this time, the signal may include a PC name set by the user and an account of the instant messaging service (for example, an ID of an instant messaging service provided by the mobile terminal).

When receiving the first authentication request signal from the personal computer, the instant message server may generate the first key and the unique PC ID, and then store the generated information together with the received PC name in the database (314).

The instant message server may share a first key with a mobile terminal and a personal computer. For example, the instant message server may issue a first key to the mobile terminal using the account of the instant messaging service (315). In this case, the instant message server may transmit not only the first key but also a unique PC ID and PC name.

In addition, the instant message server may issue a first key to the personal computer using a client installed in the personal computer (316). In this case, the instant message server may transmit not only the first key but also a unique PC ID and PC name.

When the mobile terminal has issued the first key, the mobile terminal can broadcast the IP of the mobile terminal on the same band network (318). For example, assume that a mobile terminal is provided with a wireless Internet by an access point (AP). In this case, the mobile terminal can broadcast the IP of the mobile terminal on the wireless network formed by the access point.

When the personal computer is located on the same band network as the mobile terminal, the personal computer can receive the IP of the broadcasted mobile terminal. The personal computer may transmit the second authentication request signal including the first key using the IP of the mobile terminal (319). Here, the second authentication request signal may further include an IP of the personal computer and a password of the instant messaging service.

The mobile terminal can authenticate the personal computer based on the first key received from the personal computer. For example, the mobile terminal may compare whether the first key received from the instant message server and the first key received from the personal computer are the same. The mobile terminal can request password authentication to the instant message server using the password of the instant messaging service received from the mobile terminal according to the determination that the two keys are identical (320).

If the instant message server receives a response 321 indicating that the password authentication has been successfully performed, the mobile terminal may generate 322 a second key that is distinct from the first key. The mobile terminal can issue the second key to the personal computer (323), and the personal computer can store the second key (324) issued from the mobile terminal.

When receiving a reception message transmitted from another user, the instant message server may transmit the reception message to the mobile terminal (325). The mobile terminal may encrypt the received message using the second key, and then transmit the encrypted received message to the personal computer (326). In this case, since the personal computer stores the second key, it can decrypt the encrypted received message. The personal computer can display the decrypted received message.

When a transmission message is input from the user, the personal computer encrypts the transmission message using the second key, and then transmits the encrypted transmission message to the mobile terminal (327). In this case, since the mobile terminal stores the second key, it can decrypt the encrypted transmission message. The mobile terminal may transmit the decrypted transmission message to the instant message server (328).

Although not shown in the drawing, the mobile terminal according to another embodiment may transmit the chat history to the personal computer after issuing the second key to the personal computer (323). Here, the chat history may include at least one of a list of chat rooms in which a user of the mobile terminal is participating in the instant messaging service, or a conversation history of each chat room.

Accordingly, the mobile terminal can provide not only a message that is newly transmitted and received after the authentication with the personal computer is successfully performed, but also a technique of allowing a previously transmitted message to be confirmed by the personal computer.

4 is a diagram for explaining a connection status confirmation method between a mobile terminal and a personal computer according to an exemplary embodiment of the present invention.

Referring to FIG. 4, a mobile terminal according to an exemplary embodiment may receive a connection status confirmation signal transmitted at predetermined intervals from a personal computer (413). For example, the personal computer can broadcast the signal on a network of the same band every predetermined period.

The mobile terminal can maintain the connection with the personal computer when receiving the connection status confirmation signal from the personal computer. For example, the mobile terminal may transmit a response signal including the IP of the mobile terminal to the personal computer in response to receiving the connection status confirmation signal (414).

If the connection status confirmation signal transmitted from the personal computer is not received (415), the mobile terminal can transmit the connection status confirmation signal to the personal computer (416).

If the mobile terminal does not receive a response signal to the connection status re-confirmation signal from the personal computer (417), the mobile terminal can terminate the connection with the personal computer (418).

Meanwhile, the personal computer may transmit a connection status confirmation signal for reconnection with the mobile terminal (411).

For example, assume that the personal computer has completed the authentication process described above with reference to Figures 1-3. In this case, the personal computer stores a second key that is shared with the mobile terminal. Thus, the personal computer need not go through the authentication process again.

In the state where the connection between the personal computer and the mobile terminal is terminated, the user may desire to reconnect between the personal computer and the mobile terminal. In this case, the personal computer can transmit a connection status confirmation signal to the mobile terminal. The personal computer can transmit the signal to the mobile terminal by broadcasting a connection status confirmation signal on the network of the same band.

When receiving the connection status confirmation signal from the personal computer, the mobile terminal can reconnect with the personal computer by transmitting a response signal including the IP of the mobile terminal to the personal computer (412).

5 is a view for explaining a method of requesting an IP of a mobile terminal to an instant message server according to an embodiment of the present invention.

Referring to FIG. 5, the personal computer according to one embodiment may transmit a connection status confirmation signal to a mobile terminal (511). 4 can be directly applied to the transmission of the connection status confirmation signal, so that a detailed description thereof will be omitted.

Meanwhile, the personal computer may not receive the connection maintaining signal including the IP of the mobile terminal from the mobile terminal (512). In this case, the personal computer may request mobile terminal related information to the instant message server (513).

The personal computer according to one embodiment may request the IP of the mobile terminal with the instant message server. The instant message server may obtain the IP of the mobile terminal from the mobile terminal in response to a request from the personal computer.

For example, the instant message server may send an IP request signal of the mobile terminal to the mobile terminal (514). In response to receiving the IP request signal, the mobile terminal may transmit a response signal including the IP of the mobile terminal to the instant message server (515).

The instant messaging server may send the mobile terminal's IP to the personal computer (516). In this case, the personal computer can connect to the mobile terminal using the IP of the mobile terminal provided from the instant message server.

If the personal computer according to another embodiment does not receive the connection maintaining signal including the IP of the mobile terminal from the mobile terminal, the personal computer may request the location of the mobile terminal to the instant message server. In this case, the instant message server may obtain the location of the mobile terminal from the mobile terminal in response to the request of the personal computer. The personal computer may receive the location of the mobile terminal from the instant message server. Accordingly, the instant messaging service according to the embodiment can provide a technique of tracking the location of the mobile terminal when the user loses the mobile terminal.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (19)

A method of instant messaging service of a mobile terminal,
Authenticating the personal computer using a first key shared between the instant message server, the mobile terminal, and a personal computer (PC);
Generating a second key different from the first key when the authentication is successfully performed;
Sending the second key to the authenticated personal computer;
Receiving a received message from the instant message server;
Encrypting the received message using the second key in response to receiving the received message;
Transmitting an encrypted received message to the authenticated personal computer;
Receiving an encrypted transmission message from the authenticated personal computer;
Decrypting the encrypted transmission message using the second key in response to receiving the encrypted transmission message; And
Transmitting the decrypted transmission message to the instant message server
Lt; / RTI >
Wherein authenticating the personal computer comprises:
Authenticates the personal computer by comparing whether the first key received from the instant message server is identical to the first key received from the personal computer,
Wherein the first key comprises:
Based on an account of the instant messaging service delivered from the personal computer to the instant message server according to the authentication request of the personal computer,
Wherein the account is an account of an instant messaging service provided to a mobile terminal and the second key is shared between the mobile terminal and the personal computer. The method according to claim 1,
Before the step of authenticating the personal computer,
Broadcasting IP information of the mobile terminal to a network of a predetermined range; And
Receiving an authentication request signal from the personal computer which has received the IP information
The instant messaging service method comprising: The method according to claim 1,
Receiving a connection status confirmation signal transmitted every predetermined period from the authenticated personal computer;
Maintaining a connection with the authenticated personal computer when the connection status confirmation signal is received;
Transmitting a connection state reconfirmation signal to the authenticated personal computer when the connection state confirmation signal is not received so that the predetermined period elapses; And
And terminating the connection with the authenticated personal computer when a response signal to the connection status re-confirmation signal is not received from the authenticated personal computer
The instant messaging service method comprising: The method according to claim 1,
Receiving a request signal of the mobile station related information from the instant message server; And
Transmitting a response signal including the mobile station related information to the instant message server in response to the reception of the request signal
Further comprising:
Wherein the instant message server transmits the request signal in response to a request of the authenticated personal computer and transmits the mobile terminal related information to the authenticated personal computer in response to the reception of the response signal . The method according to claim 1,
Transmitting the chat history to the personal computer when the authentication is successfully performed
Further comprising:
Wherein the chat history comprises at least one of a list of participating chat rooms or a conversation history in a participating chat room. The method according to claim 1,
Determining whether the authenticated personal computer is present; or
Confirming a connection state with the authenticated personal computer
Further comprising at least one of:
The step of transmitting the received message
Determining whether to transmit the reception message according to at least one of the determination result and the confirmation result
The instant messaging service method comprising: A method of operating a personal computer (PC) interworking with a mobile terminal for an instant messaging service,
Generating an authentication request signal using a first key shared between the instant message server, the mobile terminal, and the personal computer;
Transmitting the authentication request signal to the mobile terminal;
Receiving a second key different from the first key from the mobile terminal;
Receiving an encrypted received message from the mobile terminal;
Decrypting the encrypted received message using the second key in response to receiving the encrypted received message;
Displaying a decrypted received message;
Providing an interface for receiving a transmission message;
Encrypting the transmission message using the second key in response to the input of the transmission message over the interface; And
Transmitting an encrypted transmission message to the mobile terminal
Lt; / RTI >
The second key is generated by the mobile terminal when the authentication of the personal computer according to the authentication request signal is successfully performed and the second key is shared between the mobile terminal and the personal computer,
The authentication for the personal computer includes:
Comparing the first key received from the instant message server with the first key received from the personal computer by the mobile terminal,
Wherein the first key comprises:
Based on an account of the instant messaging service delivered from the personal computer to the instant message server according to the authentication request of the personal computer,
Wherein the account is an account of an instant messaging service provided to the mobile terminal. 8. The method of claim 7,
Before the step of generating the authentication request signal,
Receiving IP information of the mobile terminal broadcasted to a network of a predetermined range
Further comprising the steps of: 8. The method of claim 7,
Transmitting a connection status confirmation signal to the mobile terminal every predetermined period or in response to the request of the mobile terminal; And
Receiving a connection maintaining signal including an IP of the mobile terminal from the mobile terminal
Further comprising the steps of: 10. The method of claim 9,
Requesting the mobile terminal related information to the instant message server when the connection holding signal is not received from the mobile terminal; And
Receiving the mobile terminal related information from the instant message server
Further comprising:
And the instant message server obtains the mobile terminal related information from the mobile terminal in response to the request. The method according to claim 1,
The first key
And the instant message is transmitted to the mobile terminal and the personal computer by the instant message server. The method according to claim 1,
The step of authenticating the personal computer
Comparing a key received from the personal computer with a key received from the instant message server; And
Determining whether the personal computer is authenticated according to the comparison result
Wherein the instant messaging service method comprises: The method according to claim 1,
The step of authenticating the personal computer
Decrypting the encrypted information included in the authentication request signal received from the personal computer using the first key; And
Requesting authentication with the instant message server using the decrypted information
Wherein the instant messaging service method comprises: The method according to claim 1,
The first key
Wherein the instant messaging service is generated by the instant message server based on information transmitted from the personal computer to the instant message server. 8. The method of claim 7,
The first key
And the instant message is transmitted to the mobile terminal and the personal computer by the instant message server. 8. The method of claim 7,
In response to the authentication request signal,
Wherein the mobile terminal compares a key included in the authentication request signal with a key received from the instant message server and determines whether the personal computer is authenticated according to the comparison result. 8. The method of claim 7,
In response to the authentication request signal,
Wherein the mobile terminal decrypts the encrypted information included in the authentication request signal using the first key and requests authentication to the instant message server using the decrypted information. 8. The method of claim 7,
The first key
Wherein the instant message is generated by the instant message server based on information transmitted from the personal computer to the instant message server. A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 1 to 18.

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