KR101671780B1 - Method for push to talk group communication - Google Patents

Abstract

A PTT group communication method is provided. A PTT group communication method according to an embodiment of the present invention is a step of creating a new PTT integration group including a plurality of terminals belonging to different PTT (Push to Talk) base groups, The plurality of terminals sharing the same cryptographic key; And communicating within the PTT unified group, comprising receiving data to which the cipher key is applied from a terminal included in the PTT unified group or transmitting data to which the cipher key is applied to a terminal included in the PTT unified group .

Description

{METHOD FOR PUSH TO TALK GROUP COMMUNICATION}

The present invention relates to a PTT group communication method, and more particularly, to a PTT group communication method for dynamically operating a cryptographic key used for PTT group communication.

The Push to Talk (PTT) service is a kind of radio service. When a PTT service is used, a plurality of people can simultaneously hear a single person speaking through a terminal by pressing a button. For this purpose, the PTT service may use a wireless communication network such as Long Term Evolution (LTE), Wi-Fi, Bluetooth and 3G, or may use an IP (Internet Protocol) based data network.

On the other hand, the PTT service can provide a service on a group-by-group basis. Specifically, the PTT service can provide a service so that communication can be performed among terminals belonging to the same group. However, the present invention is not limited to this, and the PTT service can provide a limited number of services to an unspecified number of users or to a terminal located in a specific area by limiting the range of the area.

However, according to the related art, only the data transmitted through the network is encrypted between the user terminal and the user terminal for security of the PTT service.

In this situation, if the same terminal as the terminal for using the PTT service is used or if the password of the communication channel is exposed, the data transmitted through the PTT service can be leaked to the outside and decrypted. For example, a situation may arise in which a tow vehicle moves to an accident site by tapping a radio telephone call history of a police officer or firefighter.

Therefore, in the PTT group communication in the group unit, a data security communication technology capable of preventing eavesdropping or eavesdropping is in a serious situation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a PTT group that can dynamically operate a cryptographic key used for a corresponding PTT group communication when operating a PTT group or a project- Group communication method.

Another technical problem to be solved by the present invention is to provide a PTT group communication method capable of generating a PTT group on a project-by-project basis and maintaining communication security in relation to an existing PTT group will be.

The technical objects of the present invention are not limited to the above-mentioned technical problems, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a PTT group communication method for generating a new PTT integration group including a plurality of terminals belonging to different PTT (Push to Talk) basic groups Wherein the plurality of terminals included in the same PTT integration group share the same cryptographic key; And communicating within the PTT unified group, comprising receiving data to which the cipher key is applied from a terminal included in the PTT unified group or transmitting data to which the cipher key is applied to a terminal included in the PTT unified group .

According to the present invention as described above, the following effects can be derived, but the effects according to the present invention are not limited thereto.

First, information leakage can be prevented by dynamically operating a cryptographic key used for PTT group communication. Specifically, when a PTT group of a new project unit is created, a cryptographic key used for communication of the corresponding PTT group is newly generated, so communication security can be maintained in relation to the existing PTT group.

Secondly, the cryptographic key used for PTT group communication is not directly transmitted to the terminal included in the PTT group, but only the cryptographic key generation data used for generating the cryptographic key is provided to each terminal. In order to generate the cryptographic key Since internal data stored in the terminal is additionally required, communication security in the PTT group communication can be maintained even if cryptographic key generation data is leaked to the outside.

1 is a flowchart illustrating a PTT group communication method according to an embodiment of the present invention.
2 is a schematic diagram of a PTT group communication system for illustrating step S10 of creating the PTT base group of FIG.
3 is a schematic diagram of a PTT group communication system for illustrating step S20 of creating the PTT unified group of FIG.
4 is a flowchart specifically illustrating a step S20 of generating the PTT unified group of FIG.
FIG. 5 is a flowchart specifically illustrating a step (S20) of creating a PTT unified group and a step (S30) of communicating in the PTT unified group.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Hereinafter, a PTT group communication method according to embodiments of the present invention will be described with reference to the drawings.

1 to 5, a PTT group communication method according to an embodiment of the present invention will be described. Referring to FIG. 1, a flowchart illustrating a method of communicating a PTT group according to an exemplary embodiment of the present invention is shown. Referring to FIG. 2, a PTT group 3, there is shown a schematic diagram of a PTT group communication system to illustrate step S20 of creating a PTT unified group of FIG. 1, and with reference to FIG. 4, (S20) of creating a PTT unified group of FIG. 1, and referring to FIG. 5, a step (S20) of creating a PTT unified group and a step (S30 ) Is specifically disclosed. However, not all the steps shown in FIG. 1 are essential steps, and a PTT group communication method having more steps or fewer steps may be performed.

First, in order to effectively explain a PTT group communication method according to an embodiment of the present invention, a PTT group communication system capable of performing a PTT group communication method according to an embodiment of the present invention will be described with reference to FIG. 2 .

The PTT group communication system may include a PTT server 10 and the PTT server 10 may include a PTT control server 11 and a PTT service server 12. [

The PTT control server 11 may be a server that manages the PTT group communication system as a whole and may perform functions such as generating a PTT group or generating a cryptographic key or cryptographic key generation data for each PTT group.

The PTT service server 12 can perform a function related to the PTT group communication. For example, the PTT service server 12 receives the data to which the encryption key is applied from each terminal 20, Can be transmitted. Here, the PTT group may be a minimum unit in which the PTT service is provided in the group unit, and transmitting data to the PTT group may mean transmitting data to the terminal 20 included in the PTT group. To this end, The service server 12 may have information on the terminals included in the PTT group in charge of the corresponding PTT service server 12. [

The PTT service server 12 can be operated in a plurality of ways, and the PTT basic group 30 to be managed and charged for each PTT service server 12 can be determined. However, the PTT service server 12 may not be able to take charge of only one PTT basic group 30, and may take charge of a plurality of PTT basic groups 30. Since the terminals included in the plurality of PTT basic groups 30 may belong to the PTT integration group 50, a plurality of PTT service servers 12 may be used for communication of the PTT integration group 50 have.

The terminal 20 used for the PTT group communication may be a dedicated terminal 20 for PTT group communication but is not limited thereto and may be a general terminal 20 such as a smart phone or a tablet PC, (application) may be installed

A wireless communication network such as Long Term Evolution (LTE), Wi-Fi, Bluetooth and 3G, or an IP (Internet Protocol) based data network can be used for communication between the PTT server 10 and the terminal 20 However, it is not limited thereto.

Hereinafter, a PTT group communication method according to an embodiment of the present invention will be described.

First, referring to FIGS. 1 and 2, the PTT control server 11 may generate a PTT basic group 30 (S10).

Specifically, the PTT control server 11 receives information related to the corresponding PTT basic group 30 including information on the terminal 20 included in the PTT basic group 30, thereby generating the PTT basic group 30 Can be generated. A plurality of terminals 20 may be included in one PTT basic group 30 and a plurality of terminals 20 included in the same PTT basic group 30 may share the same cryptographic key Key generation data to the plurality of terminals 20 included in the corresponding PTT basic group 30. [ However, the information necessary for communication of the PTT basic group can be provided from the PTT control server 11 to each PTT service server 12, but is not limited thereto.

Here, the encryption key generation data may be data used when the terminal 20 generates the encryption key using the internal data of the terminal 20. That is, each of the terminals 20 may include a function capable of generating information on a plurality of cipher keys or an encryption key as internal data, and the cipher key generation data may be transmitted to the PTT group 30 The terminal 20 can use the internal data of the terminal 20 and the received cryptographic key generation data to generate the cryptographic key It is possible to generate a cryptographic key used for PTT group communication of the corresponding PTT basic group 30.

Therefore, it is the cryptographic key generation data that a plurality of terminals 20 included in the same PTT basic group 30 are similarly transmitted from the PTT control server 11, but the plurality of terminals 20 receive the received cryptographic key generation data All of the terminals 20 included in the same PTT basic group 30 share the same cryptographic key.

In the communication within the PTT basic group 30, the data transmitted from each terminal 20 to the PTT service server 12 may be data to which the generated encryption key is applied. Specifically, the data encrypted using the generated encryption key Lt; / RTI > The data transmitted from the PTT service server 12 to each terminal 20 may also be data encoded using an encryption key. Therefore, even if data used for communication in the PTT basic group 30 is received for eavesdropping or tapping, since the corresponding data is coded, it may be difficult to eavesdrop or eavesdropper unless it has an encryption key capable of decrypting the data .

Furthermore, since the terminal 20 is not the cryptographic key but the cryptographic key generation data, even if it receives the cryptographic key generation data provided from the PTT control server 11 to the terminal 20 for eavesdropping or tapping, It may be difficult to generate a cryptographic key using only the key generation data.

Therefore, according to the PTT group communication method according to the embodiment of the present invention, since the cryptographic keys shared by each PTT basic group 30 are different, the communication security between the plurality of PTT basic groups 30 can be ensured , It is possible to secure the security according to the PTT group communication from the outside.

Meanwhile, the PTT base group 30 may be a group to which each terminal 20 belongs basically for PTT group communication, and one terminal 20 can not be included in two PTT base groups 30 at the same time.

Referring to FIG. 2, a plurality of PTT basic groups 30 may be formed to have a hierarchical structure within one PTT operation unit. Here, one PTT operation unit may mean a large unit for operating a plurality of PTT basic groups 30, and may be, for example, a PTT operation unit of a country unit or a large enterprise unit, but is not limited thereto.

The hierarchical structure may be a tree structure, and may have a middle layer between the top layer and the bottom layer, and between the top layer and the bottom layer. The PTT base group 30 placed in the upper layer may have a relative importance, a specific weight or an authority or the like relative to the PTT base group 30 placed in the lower layer The characteristics of each layer can be changed according to the characteristics of each PTT operation unit.

For example, the PTT basic group 30 related to the organization of the central government department may be located in the first hierarchical level 41, which is the highest hierarchical level, and the second hierarchical hierarchy 42, The related PTT base group 30 can be placed and the PTT basic group 30 related to the city, county, and county organizations can be placed in the third hierarchy 43, which is the lower hierarchy, The PTT base group 30 related to the organization of the base, the town, the village, and the village may be arranged in the fourth layer 44, but is not limited thereto.

Therefore, according to the PTT group communication method according to the embodiment of the present invention, each terminal 20 can be included in the corresponding PTT basic group 30 as needed, Key can be used to perform reliable PTT group communication.

1 and 3, the PTT control server 11 can generate the PTT integration group 50 (S20). Specifically, the PTT control server 11 generates a plurality of PTT base groups 30 A new PTT unified group 50 including the new PTT unified group 50 can be created and a plurality of terminals 20 included in the same PTT unified group 50 can share the same cryptographic key.

Here, the PTT integration group 50 may be a PTT group that is temporarily distinguished from the PTT base group 30 and can be created for a specific project. The PTT integration group 50 may include a plurality of terminals 20 belonging to different PTT base groups 30.

Hereinafter, the step S20 of creating the PTT integration group 50 will be described in detail with reference to Figs. 4 and 5. Fig.

4 and 5, the PTT control server 11 selects, from among a plurality of terminals 20 included in a plurality of PTT base groups 30 having a hierarchical structure, (S21). ≪ / RTI >

For example, in the event of an emergency, such as a disaster, instructions need to be communicated simultaneously to the government departments, agencies, or personnel involved to deal with the disaster. Accordingly, in this case, a plurality of terminals 20 to be included in the PTT integration group 50 can be determined regardless of the PTT basic group 30, and the PTT control server 11 can acquire PTT Information about the terminal 20 to be included in the integrated group 50 can be input.

That is, the step of receiving the terminal 20 to be included in the PTT integration group 50 includes receiving information on the terminal 20 to be included in the PTT integration group 50 from any one of the terminals 20 And any one of the terminals 20 may be the terminal 20 included in any one of the plurality of PTT basic groups 30.

However, any one of the terminals 20 may select one of the terminals 20 included in the PTT base group 30 of the same layer or lower layer as the PTT base group 30 including the corresponding terminal 20, The terminal 20 can be selected. That is, the terminal 20, which is responsible for the configuration of the PTT integration group 50, determines whether or not the terminal 20 included in the PTT basic group 30 corresponding to a higher layer than the PTT base group 30 including the terminal 20 20), there is no right to add to the PTT integration group 50. [ Therefore, when configuring the PTT integration group 50, the range in which the PTT integration group 50 can be configured may vary depending on the hierarchical status of the terminal 20 planning the configuration of the PTT integration group 50 have.

The configuration principles of this PTT integration group 50 may reflect realistic organizational operating principles and may be, but are not limited to, to streamline organizational communications.

5, a session creation (hereinafter referred to as a session creation) to configure a PTT base group B 30 and a PTT base group C 30 as one PTT integration group 50 from any one of the terminals 20 ) Information can be input to the PTT control server 11.

4 and 5, the PTT control server 11 transmits the encryption key generation data to the PTT integration group 50 so that the plurality of terminals 20 included in the PTT integration group 50 can share the same encryption key. To a plurality of terminals (20) included in the group (50).

5, the encryption key generation data may be transmitted from the PTT control server 11 to the PTT base group B 30 and the PTT base group C 30 constituting the PTT integration group 50 have.

As described above, the encryption key generation data may be data used when the terminal 20 generates the encryption key using the internal data of the terminal 20. That is, each terminal 20 may include a function capable of generating information on a plurality of cipher keys or an encryption key as internal data, and the cipher key generation data may be transmitted to the PTT group 50 The terminal 20 can use the internal data of the terminal 20 and the received cryptographic key generation data to generate the cryptographic key It is possible to generate a cryptographic key used for PTT group communication of the corresponding PTT integration group 50.

Therefore, it is the cryptographic key generation data that a plurality of terminals 20 included in the same PTT integration group 50 are equally transmitted from the PTT control server 11, but the plurality of terminals 20 receive the received cryptographic key generation data All of the terminals 20 included in the same PTT integration group 50 share the same cryptographic key.

Each PTT base group 30 and each PTT integration group 50 share a different cryptographic key. For this purpose, each PTT base group 30 or each PTT integration group 50 50 may also be different from the cryptographic key generation data provided to the terminal 20. Thus, the communication security between each PTT base group 30 and each PTT integration group 50 can be maintained.

That is, according to the PTT group communication method according to an embodiment of the present invention, when a new PTT integration group 50 is generated, a cryptographic key required for the new PTT integration group 50 is generated and transmitted to the terminal 20 ), It is possible to dynamically operate the encryption key, thereby enhancing the reliability of the PTT communication security.

1 and 5, the PTT service server 12 can communicate within the PTT integration group 50 (S30), and specifically, The data to which the encryption key is applied from the terminal 20 included in the PTT integration group 50 or the data to which the encryption key is applied to the terminal 20 included in the PTT integration group 50 can be transmitted.

The terminal 20 included in the PTT integration group 50 can not access the PTT base group 30 including the terminal 20 while performing the step S30 of communicating in the PTT integration group 50. [ The communication may not be performed. Accordingly, the terminal 20 can not receive data from the PTT basic group 30.

Therefore, according to the PTT group communication method according to an embodiment of the present invention, not only the security in the PTT group communication between the PTT basic groups 30 can be maintained, but also the PTT integration group 50, And the PTT base group 30 can also be secured.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: PTT server 11: PTT control server
12: PTT service server 20: terminal
30: PTT basic group 41: first layer
42: Layer 2 43: Layer 3
44: fourth layer 50: PTT integrated group

Claims (7)

The method comprising: generating a new PTT unified group including a plurality of terminals belonging to different PTT (Push to Talk) base groups, the plurality of terminals included in the same PTT unified group share the same cryptographic key, Creating an integrated group; And
Receiving data to which the cipher key is applied from a terminal included in the PTT unified group or transmitting data to which the cipher key is applied to a terminal included in the PTT unified group;
Lt; / RTI >
Wherein the step of generating the PTT unified group comprises:
Receiving information on a terminal to be included in the PTT integration group among a plurality of terminals included in a plurality of PTT basic groups having a hierarchical structure,
Transmitting cryptographic key generation data to a plurality of terminals included in the PTT integration group so that a plurality of terminals included in the PTT integration group can share the same cryptographic key
Lt; / RTI >
Wherein the encryption key generation data is data used when a terminal generates an encryption key using internal data stored in the terminal. delete delete The method according to claim 1,
The step of receiving a terminal to be included in the PTT integration group is a step of receiving information on a terminal to be included in the PTT integration group from any one of the terminals,
Wherein the one of the terminals is a terminal included in any one of the plurality of PTT basic groups,
Wherein the one of the terminals can select a terminal to be included in the PTT integration group among the terminals included in the PTT basic group of the same layer or lower layer as the PTT basic group including the corresponding terminal. The method according to claim 1,
Wherein during the step of communicating within the PTT unified group, the UEs included in the PTT unified group do not perform communication within the PTT base group including the corresponding UE. The method according to claim 1,
Further comprising creating a plurality of PTT (Push to Talk) base groups having a hierarchical structure before creating the PTT unified group,
Wherein a plurality of terminals included in the same PTT basic group share the same cryptographic key. The method according to claim 6,
The communication of the PTT basic group and the PTT unified group is performed using a cryptographic key shared in each group,
Wherein the cipher keys used for communication in the PTT basic group and the PTT unified group are different for each group.

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