KR100606340B1 - Method for transmission of short message in communication system - Google Patents

Abstract

The present invention provides a method for transmitting a short message in a communication system, the method comprising: transmitting a short message from an originating terminal, encrypting the short message, transmitting the short message to a service center, and sending a delivery report message to the originating terminal; And a receiving step of transmitting the encrypted short message to the called terminal and receiving a delivery report message in the service center, so that only a valid subscriber terminal can use the short message sending / outgoing service, thereby providing a short message service of the illegal copy terminal. It will be able to prevent use.

Description

Method for transmission of short message in communication system

1 is a block diagram of a general communication system,

2 is a flowchart showing an operation of transmitting a short message in a conventional communication system;

3 is a flowchart illustrating an operation in the communication system of FIG.

4 is a flowchart showing an incoming operation in the short message transmission method of the conventional communication system,

5 is a flowchart illustrating an operation in the communication system of FIG. 4;

6 is a flowchart illustrating a method of transmitting a short message in a communication system according to the present invention;

FIG. 7 is a detailed flowchart of the transmitting step in FIG. 6;

8 is a flowchart illustrating an operation of the communication system of FIG. 7;

9 is a detailed flowchart of the incoming step in FIG.

10 is a flow chart showing operation in the communication system of FIG.

Explanation of symbols on the main parts of the drawings

10: terminal (MS) 11: calling terminal

12: called terminal 20: exchange (SGSN)

30: Home Location Register (HLR) 40: MSC

41: IWMSC 42: GMSC

50: Service Center (SC)

The present invention relates to a method for transmitting a short message in a communication system, and in particular, a short message of a communication system which is suitable for preventing the use of a short message service of an illegal copy terminal by allowing only a valid subscriber terminal to use a short message incoming / outgoing service. It relates to a message transmission method.

In general, a communication system is a system that performs information processing by combining a terminal with a remote communication line, and there are wired and wireless communication systems. The wireless communication system is a communication system for mobile devices such as people, cars, ships, trains and aircraft, including mobile phones (mobile phones, vehicle phones), port phones, aircraft phones, mobile public phones (trains, cruise ships, Installed on express buses, radio calls, radiotelephones, satellite communications, amateur radio, and fishing service ships.

The mobile communication system includes an AMPS (Advanced Mobile Phone Service) system using an analog method, a Code Division Multiple Access (CDMA) system using a digital method, and a Time Division Multiple Access (TDMA) system. , Frequency Division Multiple Access (FDMA) system, Wireless Local Loop (WLL), CDMA2000-1x, IMT-2000 (International Mobile Telecommunication in the year 2000), WCDMA (Wideband Code Division Multiple Access) system.

In addition, SMS (Short Message Service) is a service that can send a message up to 160 characters to a mobile phone using GSM (Global System for Mobile communication). GSM and SMS services were initially available only in Europe. SMS is similar to a paging service. However, SMS messages are retained for a few days until the phone is available for calls, even if the phone is turned off or even in an area where calls are unavailable. The SMS message can be sent to anyone in the same cell or who is receiving roaming service. The message may be sent from a website to a mobile phone, or may be sent from phone to phone (phone to phone).

1 is a block diagram of a general communication system.

Here, reference numeral 10 is a mobile station (MS) used by a user in a communication system, 11 is a calling terminal used by a calling user, 12 is a called terminal used by a called user, and 20 is an SGSN. (Serving GPRS Support Node) is a switch to perform the exchange function, 30 is a Home Location Register (HLR) for registering the location of the terminal 10.

In addition, reference numeral 40 is a mobile switching center (MSC) for switching in a communication system, 41 is an interworking mobile switching center (IWMSC) located in the MSC 40, and 42 is a gateway mobile located in the MSC 40. Switching Center), and 50 is a service center (SC) that provides a short message service.

2 is a flowchart illustrating an outgoing operation in a method of transmitting a short message in a conventional communication system, and FIG. 3 is a flowchart illustrating an operation in the communication system of FIG. 2.

As shown in FIG. 5, when the short message is transmitted from the calling terminal 11, the short message, the service center address, and the Mobile Subscriber ISDN Number (MSISDN) may be included. Transmitting from the SGSN to the IWMSC 41 (ST11) (ST12); Transmitting a short message from the IWMSC 41 to the service center 50 corresponding to the service center address (ST13); The service center 50 transmitting a short message to the destination terminal 12 and transmitting a delivery report message to the IWMSC 41 (ST14); The IWMSC 41 transmits a delivery report message to the originating terminal 11 through the switch 20 (ST15).

4 is a flowchart illustrating an incoming operation in the short message transmission method of the conventional communication system, and FIG. 5 is a flowchart illustrating an operation in the communication system of FIG.

As shown therein, the service center 50 transmits a short message of the calling terminal 11 to the GMSC 42 (ST21); The GMSC 42 sends a SendRoutingInfoForSM message including the MSISDN and the service center address of the called terminal 12 to the home location register 30 to receive a response (ST22); The GMSC (42) transmitting an MT_Forward_short_message to an exchange (20) in which the terminating terminal (12) is registered; The switch 20 transmits a short message of the originating terminal 11 to the called terminal 12 and sends a delivery report message including a transmission result to the service center 50 through the GMSC 42. A step ST24 is performed.

The operation of the prior art configured as described above will be described in detail with reference to the accompanying drawings.

First, according to the prior art, when the calling terminal 11 sends a short message to any called terminal 12, the service center 50 sends a short message through the exchange 20 in which the called terminal 12 is currently registered. Transfer and inform the originating terminal 11 of the transmission result.

If the receiving terminal 12 cannot receive the short message (power off, memory is exceeded, etc.), the receiving terminal 12 registers the receiving terminal 12 in a pending state in the home location register 30 and then uses the receiving terminal 12. When enabled, it is retransmitted through the service center 50.

This prior art operation will be described in more detail.

First, the process of sending a short message is described.

2 and 3, the short message is transmitted from the calling terminal 11 to the called terminal 12.

The short message transmitted from the originating terminal 11 is then delivered to the switch 20 with SGSN.

The exchange 20 transmits a MO_Forward_Short_message containing a short message, a service center address, and MSISDN information to the IWMSC 41. Here, MO stands for mobile origination and means location information of the calling terminal 11.

The IWMSC 41 transmits a short message to the service center 50 corresponding to the service center address included in the MO_Forward_Short_message.

The service center 50 transmits the short message of the calling terminal 11 to the called terminal 12 and then transmits a delivery report message including the transmission result to the IWMSC 41.

The IWMSC 41 transmits the delivery report message received from the service center 50 to the exchange 20.

The exchange 20 transmits the delivery report message received from the IWMSC 41 to the originating terminal 11.

Meanwhile, the incoming process of the short message will be described with reference to FIGS. 4 and 5.

The service center 50 transmits the short message transmitted from the calling terminal 11 to the GMSC 42.

The GMSC 42 transmits the SendRoutingInfoForSM message, which is the MSISDN and the service center address information, of the terminating terminal 12 to the home location register 30.

The home location register 30 includes the location information of the called terminal 12 in the SendRoutingInfoForSM ack and transmits it to the GMSC 42.

The GMSC 42 sends MT_Forward_short_message to the exchange 20 in which the current location of the terminating terminal 12 is registered. MT stands for Mobile Termination and means location information of the called terminal 12.

The exchange 20 transmits a short message of the calling terminal 11 to the called terminal 12 and receives a delivery report message including the transmission result.

The exchange 20 sends a delivery report message to the GMSC 42.

GMSC 42 transmits the delivery report message received from the exchange 20 to the service center 50.

However, this conventional technology has the following problems.

When a short message is sent from an originating terminal to any called terminal, the service center delivers the short message through an exchange (SGSN) in which the called terminal is currently registered. Since the service center transmits a short message only by looking at the location registration information of the called terminal, an illegal copy terminal can also receive a short message of the called terminal at any time. Since the short message is in plain text, anyone can view the contents at the same time as the reception.

In addition, when the short message is sent from the counterfeit terminal can be delivered through the service center.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to solve the problem that the leakage of personal information is caused by receiving or sending a short message received by the illegal copy terminal as a valid subscriber. In order to provide a short message transmission method of a communication system that only a valid subscriber terminal can use a short message incoming / outgoing service to prevent the use of a short message service of an illegal copy terminal.

Short message transmission method of the communication system according to an embodiment of the present invention to achieve the above object,

Transmitting a short message from the calling terminal, encrypting the short message and transmitting the short message to a service center and sending a delivery report message to the calling terminal; The service center transmits an encrypted short message to a called terminal and includes a receiving step of receiving a delivery report message.

Hereinafter, an embodiment according to the present invention as described above, the technical concept of the method for transmitting a short message in a communication system will be described with reference to the drawings.

6 is a flowchart illustrating a method of transmitting a short message in a communication system according to the present invention.

As shown in FIG. 3, when the short message is transmitted from the calling terminal 11, the short message is encrypted and transmitted to the service center 50, and a sending report message is sent to the calling terminal 11 (ST31); The service center 50 transmits the encrypted short message to the called terminal 12 and receives a delivery report message.

In the transmitting step, the short message is encrypted using a hash function.

FIG. 7 is a detailed flowchart of a transmission step in FIG. 6, and FIG. 8 is a flowchart illustrating an operation of the communication system of FIG. 7.

As shown in the figure, when the short message is transmitted from the calling terminal 11, a first step (ST41) of transmitting a message authentication code (MAC) encrypted with the hash function to the switch 20; The exchange 20 is a second step (ST42) for transmitting a message including the information of the originating terminal to the IWMSC (41); The IWMSC 41 transmits a short message to the service center 50 corresponding to the service center address included in the received message (ST43); The service center 50 transmits the MAC of the calling terminal 11 to the home location register 30 and then transmits a delivery report message including the transmission result to the IWMSC 41 (ST44); The IWMSC 41 includes a fifth step ST45 of transmitting a delivery report message to the originating terminal 11 through the exchange 20.

In the second step, the message includes a MAC, a service center address, an MSISDN of the called terminal 12, and an MSISDN of the calling terminal 11, which are encrypted using a hash function with _a short key Ka. .

FIG. 9 is a detailed flowchart of an incoming step in FIG. 6, and FIG. 10 is a flowchart illustrating an operation of the communication system of FIG. 9.

As shown here, the service center 50 includes an eleventh step (ST51) of transmitting the MAC received from the calling terminal 11 to the GMSC 42; The GMSC (42) is a twelfth step (ST52) for transmitting a message containing the information of the calling terminal 11 to the home location register (30); The home location register (30) is a thirteenth step (ST53) of authenticating the legitimacy of the calling terminal (11) with the information of the calling terminal (11); The home location register (30) is a fourteenth step (ST54) for transmitting a response message including the information of the called terminal 12 to the GMSC (42); GMSC (42) is a fifteenth step (ST55) for transmitting a message to the exchange 20, the destination terminal 12 is currently registered; The switch 20 performs a sixteenth step (ST56) of transmitting a message to the called terminal 12 and transmitting a delivery report message including a transmission result to the service center 50 through the GMSC 42. do.

In the first step 12, the message is the MSISDN, the service center address, a secret key on the side of the calling terminal (11) (K _a) the encrypted MAC through a hash function to the calling terminal (11) MSISDN and the called terminal 12 of the Configure the SendRoutingInfoForSM message, including

In step 13, the MAC 'is generated using a secret key K _b corresponding to the MSISDN of the originating terminal, and the MAC of the originating terminal 11 and the MAC' are compared to justify the originating terminal 11. It verifies that the short message has been tampered with.

In the thirteenth step, the MAC 'is generated using a secret key K _b corresponding to the MSISDN of the calling terminal, and the MAC is compared with the MAC of the calling terminal 11. An error information message (SendRoutingInfoForSM return error) indicating that there is an subscriber is transmitted to the GMSC 42.

In the fourteenth step, the response message includes the information encrypted by the hash function with the secret key K _b of the called terminal 12 and the location information.

The operation of the short message transmission method of the communication system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, in order to solve the problem of leakage of personal information by receiving or sending a short message received by a valid subscriber to an illegal copy terminal, only a valid subscriber terminal can use a short message sending / outgoing service to make illegal copying. This is to prevent the use of the short message service of the terminal.

Thus, the present invention largely consists of a sending step of sending a short message and an incoming step of receiving a short message.

The mobile communication system uses a symmetric key scheme that encrypts and decrypts a secret key shared only by the subscriber and the home location register (or AUC (Authentication Center)). It provides services such as Authentication, Integrity, and Confidentiality.

Security-related information, including the subscriber's private key, is embedded in the Universal Subscriber Identity Module (USIM) card and can prevent information leakage from the outside because each piece of information is in a security zone.

Therefore, even if the USIM card is duplicated, the security information is configured to be non-replicable, so only a valid subscriber will have the correct secret key.

In the present invention, a MAC hash function is used to provide authentication and integrity when using a short message service, and confidentiality is provided by encrypting the short message with a secret key.

In this case, MAC (Message Authentication Code) is a value generated by using a message and a secret key. If the MAC sent by the sender and the MAC 'calculated by the receiver match, the receiver authenticates as a sender with a legitimate secret key. Ensures integrity that is not tampered with during transmission.

The operation of the present invention will be described in more detail by dividing the calling step and the called step as follows.

1) Sending Secure Short Message

Referring to FIGS. 7 and 8, when sending a short message from the calling terminal 11, the sending of the illegal copying terminal can be prevented by sending a MAC that can be generated only by the legitimate calling terminal 11.

Thus, the originating terminal 11 transmits the MAC (= H _Ka ) [SM] derived through the hash function to the exchange 20 as _a short message and a secret key _Ka .

The exchange sends to the IWMSC 41 a MO_Forward_Short_message including the SM || MAC encrypted with the short message, the service center address, the MSISDN of the terminating terminal 12, the MSISDN of the originating terminal 11, and the like.

The IWMSC 41 transmits a short message to the service center 50 corresponding to the service center address included in the MO_Forward_Short_message.

The service center 50 transmits the SM || MAC of the calling terminal 11 to the home location register 30 and then transmits a delivery report signal including the transmission result to the IWMSC 41.

The IWMSC 41 transmits the delivery report signal received from the service center 50 to the exchange 20.

The exchange 20 transmits the delivery report signal received from the IWMSC 41 to the originating terminal 11.

2) Secure Short Message incoming step

When the home location register 30 encrypts the short message of the calling terminal 11 with the secret key K _b of the called terminal 12 and transmits it, only the legitimate called terminal 12 having the secret key K _b is short. You can decrypt and view the message.

Thus, the service center 50 transmits the SM || MAC received from the calling terminal 11 to the GMSC 42.

The GMSC 42 transmits a SendRoutingInfoSM message including the MSISDN of the calling terminal 11, the MSISDN of the called terminal 12, the service center address, the SM || MAC, and the like to the home location register 30.

The home location register 30 generates _a MAC '(= H _Ka [SM]) with _a secret key K _a corresponding to the MSISDN of the calling terminal 11, and if it is the same as the MAC received from the calling terminal 11, the correct calling terminal ( At the same time, it verifies that the short message is not tampered with.

In addition, if the MAC value is different from the home location register 30, the message “SendRoutingInfoSM return error [Illegal subscriber]” is transmitted to the GMSC 42.

The home location register 30 transmits the E _Kb [SM] encrypted with the secret key K _b of the destination terminal 12, and transmits a delivery report message including the transmission result to the service center 50 through the GMSC 42. do.

As such, the present invention allows only a valid subscriber terminal to use a short message call / outgoing service, thereby preventing use of the short message service of an illegal copy terminal.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the short message transmission method of the communication system according to the present invention has the effect of preventing the use of the short message service of the counterfeit terminal by allowing only valid subscriber terminals to use the short message incoming / outgoing service. Will be.

In addition, there is an effect to protect the privacy, etc. by preventing the leakage of personal information that can occur when a legitimate subscriber uses a short message.

Claims (9)

delete Transmitting a short message from the calling terminal, using a hash function to encrypt the short message, transmitting the message to a service center, and sending a delivery report message to the calling terminal; And a receiving step of transmitting the encrypted short message to the called terminal and receiving a delivery report message in the service center. The method of claim 2, wherein the originating step, A first step of transmitting, when the short message is transmitted from the calling terminal, the MAC encrypted with the short message to the exchange; The exchange step of transmitting a message including the information of the calling terminal to the IWMSC; The IWMSC transmitting a short message to the service center corresponding to the service center address included in the received message; Transmitting, by the service center, the MAC of the calling terminal to a home location register and transmitting a delivery report message including a transmission result to the IWMSC; The IWMSC includes a fifth step of transmitting a delivery report message to the originating terminal through the exchange. The method of claim 3, wherein the message in the second step, A method of transmitting a short message in a communication system, comprising a MAC encrypted with a short message as a secret key, a service center address, an MSISDN of a called terminal, and an MSISDN of a calling terminal. The method of claim 2, wherein the incoming step, The service center transmits the MAC received from the calling terminal to GMSC; The GMSC is a twelfth step of transmitting a message including information of the calling terminal to a home location register; The thirteenth step of authenticating the legitimacy of the calling terminal by the information of the calling terminal; The home location register sends a response message including information of the called terminal to the GMSC; The GMSC is a fifteenth step of transmitting a message to an exchange in which the called terminal is currently registered; And the exchange includes a sixteenth step of transmitting a message to the called terminal and transmitting a delivery report message including a transmission result to the service center through a GMSC. The method of claim 5, wherein the message in the twelfth step, A method of transmitting a short message in a communication system, comprising: a message encrypted using a hash function using an MSISDN of a calling terminal, an MSISDN of a called terminal, a service center address, and a secret key of a calling terminal. The method of claim 5, wherein the thirteenth step is Generating a MAC 'with a secret key corresponding to the MSISDN of the calling terminal, comparing the MAC with the calling MAC' of the calling terminal, authenticating the validity of the calling terminal, and confirming whether the short message has been tampered with. How to send a short message. The method of claim 5, wherein the thirteenth step is The MAC 'is generated using a secret key corresponding to the MSISDN of the calling terminal, and the MAC address of the calling terminal is compared with the MAC', and if the MAC value is different, an error is processed to transmit an error information message indicating that there is an illegal subscriber to the GMSC. Short message transmission method of a communication system. The method of claim 5, wherein the response message in the fourteenth step, And a response message including information encrypted by a hash function and location information using a secret key of the called terminal.

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