KR20180005470A - System and method for providing group call security service - Google Patents

Abstract

The present invention discloses a system and a method for providing a group call security service. According to an embodiment of the present invention, the system for providing the group call security service comprises: a call processing server which receives tag information for identifying a group call along with terminal information of a participant who participates the group call, from a terminal of a group call opener, and receives a request for the opening of the group call; a security information management server which generates participant distinguishing information by each participant in the group call for distinguishing the participant from other participants in the group call, at every group call session, and associates the participant distinguishing information with the tag information and identification information of the participant respectively for management; and an analysis server which receives a request for analyzing a sound source file that has recorded voices of the group call from a service subscriber terminal, and provides the service subscriber terminal with the identification information of the participant corresponding to detected participant distinguishing information when a watermarked participant distinguishing information is detected from the sound source file. Therefore, the system and the method for providing a group call security service can track a channel of leakage of the sound source file even when the sound source file where voices of a group call are recorded is leaked, can ensure a high watermark detection rate, and can prevent not only leakage of personal identification information on participants in the group call but also an overload in a call service system.

Description

[0001] SYSTEM AND METHOD FOR PROVIDING GROUP CALL SECURITY [

The present invention relates to a system and method for providing a group call security service, and more particularly, to a system and method for providing a group call security service, in which even when a sound source file in which a group call voice is recorded is leaked, To a group call security service providing system and method.

Generally, a group call refers to a multi-party call method in which a plurality of talkers participate in one call session, such as a conference call. In recent years, the penetration rate of mobile communication terminals such as smart phones has increased, and government agencies and many companies have introduced business mobile solutions such as BYOD (Bring Your Own Device) and UC (Unified Communication) There is a growing interest and demand for technology to ensure the security of group calls.

However, as disclosed in Korean Patent Publication No. 10-1125942 and Korean Patent Laid-Open No. 10-2011-0046922, existing technologies for performing audio watermarking in order to protect the copyright of digital audio contents , There is a problem that it can not be directly applied to the group call service. That is, the call voice is not based on the assumption that it is recorded on the medium like general audio contents but is generated in real time and disappears. Particularly, in order to secure the security of the group call involving a large number of participants, It is necessary to perform different watermarking for each voice output from the user.

In addition, when existing technologies for performing audio watermarking using fixed personal information are applied to a group call, there is a problem that a huge computing resource must be provided to a call service system that processes large-scale call sessions in real time There is a problem of causing leakage of individual unique information. Furthermore, when personal information having a considerable data length is used as watermark information, an overload is caused in the call service system. In the case where the sound source file recording the group call voice is changed by editing or the like, the watermark detection rate is significantly lowered There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for managing group call conversation, The present invention also provides a system and method for providing a group call security service that prevents leakage of unique personal information of a group call participant and overload of a call service system.

A group call security service providing system according to an embodiment of the present invention receives tag information for identifying a group call together with participant terminal information participating in a group call from a group call establisher terminal and performs call processing server; And generates participant distinguishing information for distinguishing the participant and the other participants of the group call for each participant participating in the group call for each group call session and associates the participant distinguishing information with the tag information and the unique information of the participant A security information management server; And requesting analysis of a sound source file in which a voice of the group call is recorded from a predetermined service subscriber terminal, and when watermarked participant distinguishing information is detected in the sound source file, unique information of the participant corresponding to the detected participant distinguishing information And an analysis server provided to the service subscriber terminal.

In one embodiment, the call processing server comprises: a group call information receiving unit for receiving the participant terminal information and the group call information including the tag information from the group call establisher terminal; A distinguishing information generation request unit for delivering the group call information to the security information management server and requesting generation of the participant distinguishing information; And a call connection request unit for requesting call connection to the participant terminal using the participant terminal information.

In one embodiment, the call connection request unit may transmit the participant distinguishing information of the corresponding participant to the corresponding terminal when a call is connected to the participant terminal.

In one embodiment, when the participant terminal information and the group call information including the tag information are transmitted from the call processing server, the security information management server may transmit the participant distinguishing information for each participant participating in the group call A discrimination information generating unit to generate discrimination information; A security information storage unit for storing the participant identification information in association with the tag information and the unique information of the participant; And when the tag information of the group call recorded in the sound source file and the participant distinguishing information detected in the sound source file are transmitted from the analysis server, the security information storage unit identifies the detected participant by using the transmitted tag information And a unique information retrieval unit for retrieving unique information of the participant corresponding to the information.

In one embodiment, the participant identification information generated by the security information management server may be serial number information allocated to a participant within a maximum number of participants of the group call.

In one embodiment, the analysis server comprises: a service subscriber identification unit for receiving the identification information of the service subscriber from the service subscriber terminal and confirming whether the service subscriber joins the group call security service; An analysis information receiver for receiving analysis information including the sound source file and the tag information of the group call recorded in the sound source file from the service subscriber terminal; A discrimination information detecting unit for detecting participant discrimination information watermarked on the sound source file; And transmitting the detected participant distinguishing information to the security information management server, receiving the unique information of the participant corresponding to the detected participant distinguishing information from the security information management server, And an outflow route information providing unit provided to the terminal.

In an exemplary embodiment, the system may include: generating a group call data by mixing voice data received from a plurality of participant terminals participating in the group call, and transmitting the group call data to each of the plurality of participant terminals The media server may further include a media server.

In one embodiment, the media server may watermark the participant distinguishing information to the group call data, and may transmit the watermarked group call data to the participant terminal.

A method of providing a group call security service according to an embodiment of the present invention is characterized in that the system receives tag information identifying the group call together with participant terminal information participating in a group call from a group call establisher terminal, A call processing step of requesting establishment of a call; The system generates per-participant distinction information for distinguishing between the participant and the other participants of the group call for each participant participating in the group call, and outputs the participant distinction information to each of the tag information and the unique information A security information management step of managing the security information in association with the security information; And when the system is requested to analyze the sound source file recording the voice of the group call from a predetermined service subscriber terminal and watermarked participant distinguishing information is detected in the sound source file, And providing the unique information of the service subscriber terminal to the service subscriber terminal.

In one embodiment, the method may further include a call connection request step in which the system requests a call connection to the participant terminal using the participant terminal information.

In one embodiment, the call connection request step may include, when the system connects a call to the participant terminal, transmitting the participant distinguishing information of the participant to the corresponding terminal.

In one embodiment, the security information management step may include: generating a distinguishing information for generating the participant distinguishing information for each participant participating in the group call; Storing the participant identification information in association with the tag information and the unique information of the participant; And tag information of a group call recorded in the sound source file and the sound source file is received from the service subscriber terminal and watermarked participant distinguishing information is detected in the sound source file, the system uses the received tag information And a unique information retrieving step of retrieving unique information of the participant corresponding to the detected participant discrimination information.

In one embodiment, the participant identification information generated in the security information management step may be serial number information allocated to the participant within the maximum number of participants of the group call.

In one embodiment, the analysis step includes a service subscriber identification step of receiving the identification information of the service subscriber from the service subscriber terminal and confirming whether the service subscriber joins the group call security service; Receiving the analysis information including the sound source file and the tag information of the group call recorded in the sound source file from the service subscriber terminal; The system comprising: a distinguishing information detecting step of detecting participant distinguishing information watermarked in the sound source file; And providing the unique information of the participant corresponding to the detected participant distinguishing information to the service subscriber terminal as the outgoing path information of the sound source file.

In an exemplary embodiment, the method may further comprise: the system mixes voice data received from a plurality of participant terminals participating in the group call to generate group call data, and transmits the group call data to the plurality of participant terminals And a voice data processing step of transmitting the voice data to the mobile terminal.

In one embodiment, the voice data processing step may include the step of the system watermarking the participant distinguishing information to the group call data, and transmitting the watermarked group call data to the corresponding participant terminal .

Embodiments in accordance with the present invention may be implemented in a computer program that executes the above-described operations or methods in a computer system.

According to the present invention, it is possible to allow communication terminals performing group calls to output watermarked group call voices, each of which is different from each other, thereby outputting the voice record file in which the group call voice is recorded The outgoing path of the sound source file can be tracked and the security of the group call can be ensured.

Particularly, it is possible to maintain or improve the basic call quality by using the participant distinguishing information capable of minimizing the amount of data by distinguishing participants only within the group call, such as a serial number, A watermark detection rate of a high level can be ensured even when the sound source file is changed by editing or the like.

In addition, by generating the participant distinguishing information for watermarking newly for each group call session and using it as watermark information of the group call, a unique information outflow problem that occurs when the fixed unique information of the participant is used as watermark information .

In addition, by allowing the server side providing the group call security service and the communication terminal participating in the group call to distribute the watermarking process for watermarking information and the audio watermarking process using the participant identification information, Thereby saving computing resources and overloading the call service system that needs to process the call sessions of the call service system.

Further, it will be apparent to those skilled in the art that the embodiments according to the present invention can solve various technical problems not mentioned above.

1 is a diagram illustrating a group communication environment to which the present invention is applied.
2 is a block diagram illustrating a group call security service providing system according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a process for establishing a group call in the group call security service providing method according to an embodiment of the present invention.
4A and 4B are views showing an example of a user interface screen displayed on a communication terminal when a group call is opened.
5 is a block diagram showing an example of an audio watermarking module.
6 is a flowchart illustrating a process of analyzing a sound source file of a method of providing a group call security service according to an embodiment of the present invention.
7A to 7C are views showing an example of a user interface screen displayed on a communication terminal when a tone file analysis request is made.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to clarify solutions for technical problems of the present invention. In the following description of the present invention, however, the description of related arts will be omitted if the gist of the present invention becomes obscure. In addition, the terms described below are defined in consideration of the functions of the present invention, and may be changed depending on the intention or custom of the designer, the manufacturer, and the like. Therefore, the definition should be based on the contents throughout this specification.

FIG. 1 shows a group communication environment to which the present invention is applied.

As shown in FIG. 1, in a group communication environment, users of a group call service use groups of mobile communication terminals 10, 12, 14, and 16 for communicating via a mobile communication network, The call can be performed. In this case, the group call may be performed in a voice over LTE (VoLTE) manner over an LTE (Long Term Evolution) network or in a mVoIP (mobile voice over IP) manner through a public data network.

During the course of a group call such as a conference call, any participant of the conference call group may audio capture audio of a group call voice output from the communication terminal 16 of the conference call group, So that the generated sound source file can be leaked to the outside of the enterprise. In this way, when a sound source file in which group voice is recorded is leaked to the outside, the company may suffer damage such as leakage of business secrets.

The group call security service providing system 100 according to the present invention can allow a plurality of communication terminals 10, 12, 14, and 16, which are applied to the group call environment to perform a group call, The group call voice in which the different participant distinguishing information is watermarked is outputted so that the outgoing path of the sound source file can be traced even when the sound source file recording the group call sound is leaked.

FIG. 2 is a block diagram illustrating a system 100 for providing a group call security service according to an exemplary embodiment of the present invention.

2, the group call security service providing system 100 may include a call processing server 110, a security information management server 120, and an analysis server 140, A server 130, a subscriber database 150, and the like. In addition, the system 100 may further include a SIP server (SIP server), an access gateway, an application server, an IMS server, and the like for providing basic call services .

The call processing server 110 of the group call security service providing system 100 receives the participant terminal information such as the communication number of the participant terminals 12, 14 and 16 participating in the group call from the group call establisher terminal 10 Together with receiving the tag information identifying the group call, the user can be requested to open the group call. For this, the call processing server 110 may include a group call information receiving unit 112, a distinguishing information generating requesting unit 114, and a call connection requesting unit 116.

The group call information receiving unit 112 of the call processing server 110 may receive the participant terminal information and the group call information including the tag information from the group call originator terminal 10. [ In addition, the tag information included in the group call information may be any one of information indicating a name of a group call such as a meeting name, a date and time of a call such as a meeting date, a name of a participant, or the like. As will be described later, the group call information is used as information for opening the group call, and can be used as information for tracing the outgoing route of the sound source file recording the voice of the group call in the future.

The identification information generation requesting unit 114 of the call processing server 110 may transmit the received group call information to the security information management server 120 to request the generation of the participant identification information.

The call connection request unit 116 of the call processing server 110 can request call connection to the corresponding participant terminal using the participant terminal information. In particular, the call connection request unit 116 may transmit the participant distinguishing information of the participant to the corresponding terminal when a call is connected to the participant terminals 12, 14, and 16. For example, the call connection request unit 116 may transmit the call connection request message to the participant terminal including the participant identification information.

In addition, the security information management server 120 of the group call security service providing system 100 transmits the participant distinguishing information that relatively distinguishes the participant and the other participants of the group call for each participant participating in the group call, And manage the participant identification information in association with the tag information of the group call and the unique information of the corresponding participant, respectively. For this, the security information management server 120 may include a distinguishing information generating unit 122, a security information storing unit 124, and a unique information searching unit 126.

When the participant terminal information and the group call information including the tag information are transmitted from the call processing server 110 to the security information management server 120, The participant identification information can be generated for each participant. As will be described later, the participant distinguishing information is information for generating a mark signal to be watermarked on the group call voice output from the participant communication terminal.

The participant identification information may be simple serial number information allocated to the participant within the maximum number of participants of the group call. This minimizes the problem that the data of the mark signal to be watermarked is minimized and the detection rate is drastically lowered as the mark signal data becomes longer as the mark signal data is detected, and audio watermarking is performed using the fixed unique personal information of the participant This is to prevent exposure of personal information to the user. For example, the group call establisher inputs the group currency tag information '2016.04.02_ commodity planning conference' and the communication number of the participant terminals 12, 14 and 16 through the group call application installed in the corresponding terminal 10, Upon requesting the establishment of the call, the security information management server 120 can generate serial numbers 1 to 4 corresponding to the number of participants in the group call, and transmit the serial numbers to the corresponding participant terminals.

The security information storage unit 124 of the security information management server 120 may store the participant identification information in association with the tag information and the unique information of the participant. The unique information of the participant is information for absolutely identifying the participant and may include personal information such as the name, address, communication terminal number, etc. of the participant. The security information storage unit 124 may receive and store unique information of a participant corresponding to the participant terminal information from a predetermined subscriber registration server (not shown) that stores and manages the unique information of the call service subscribers.

The unique information retrieval unit 126 of the security information management server 120 receives the tag information for identifying the group call recorded in the sound source file and the participant distinguishing information detected in the sound source file from the analysis server 140 The security information storage unit 124 may retrieve unique information of the participant corresponding to the detected participant identification information using the transmitted tag information and transmit the search result to the analysis server 140 .

Meanwhile, the analysis server 140 of the group call security service providing system 100 is requested to analyze the sound source file in which the voice of the group call is recorded from the predetermined terminal of the group call security service subscriber, The unique information of the participant corresponding to the detected participant distinguishing information can be provided to the service subscriber terminal. The analysis server 140 may include a service subscriber identity unit 142, an analysis information receiver 144, a discrimination information detector 146, and an outflow path information provider 148.

The service subscriber identity unit 142 of the analysis server 140 can receive identification information such as the ID and password of the service subscriber from the service subscriber terminal and confirm whether the service subscriber joins the group call security service. In this case, the service subscriber terminal may be a mobile communication terminal 10, 12, 14, 16 of a group call originator or a participant, or may be a separate terminal capable of performing data communication through a network such as a PC, have. Also, the service subscriber identity unit 142 may compare the identification information received from the service subscriber terminal with the identification information of the service subscribers stored in the subscriber database 150, thereby confirming whether the service subscriber joins the service.

The analysis information receiver 144 of the analysis server 140 may receive analysis information including the tag information of the group call recorded in the sound source file and the sound source file in which the group call sound is recorded from the service subscriber terminal.

The discrimination information detector 146 of the analysis server 140 can detect the participant discrimination information watermarked in the sound source file as will be described later.

The outflow route information providing unit 148 of the analysis server 140 transmits the detected participant distinguishing information to the security information management server 120 and transmits the unique information of the participant corresponding to the detected participant distinguishing information to the security And can provide it to the service subscriber terminal as the outbound path information of the sound source file received from the information management server 120.

The media server 130 of the group call security service providing system 100 may mix voice data received from participant terminals 10, 12, 14, and 16 participating in the group call after opening a group call, To generate group call data, and to transmit the generated group call data to the participant terminals 10, 12, 14, and 16, respectively.

According to the embodiment, the media server 130 directly watermarks the participant identification information in the group call data, and transmits the watermarked group call data to the corresponding terminals 10, 12, 14, and 16 have.

FIG. 3 is a flowchart illustrating a process of establishing a group call in the method of providing a group call security service according to an embodiment of the present invention. Referring to FIG. 3, the configuration and operation of the group call security service providing system 100 shown in FIG. 2 will be described in more detail.

3, the group call establisher terminal 10 transmits the tag information for identifying the group call together with participant terminal information of participants participating in the group call to the group call security service providing system 100 To request the establishment of a group call (S310). In the case of a VoIP or VoLTE type call, the signaling process uses a Session Initiation Protocol (SIP) protocol, and each participant participates in a group call through an operation procedure such as registration, invite, and ACK. In addition, each participant may leave or join in the middle of a group call.

4A and 4B show an example of a user interface screen displayed on a communication terminal when a group call is requested to be opened.

4A, when the group call establishment request is made, the group call establisher terminal 10 displays an input window 400 for inputting tag information of a group call such as a meeting name, a meeting date, And receives the group call tag information and the security service availability from the group call originator through the predetermined input means of the group call originator terminal 10. [ In addition, the group call establisher terminal 10 may further receive participant terminal information including a communication number of participants participating in the group call from the group call establisher. Then, the group call establisher terminal 10 can transmit the inputted group call tag information and participant terminal information to the system 100 to request opening of the group call.

On the other hand, as shown in FIG. 4B, the group call establisher terminal 10 may convert the group call history into a database and store the group call history in the storage means of the corresponding terminal, and display the group call history list through the display means . Such a group call history list may include group call tag information such as a meeting name and a meeting date, and participant information such as a participant name and the like.

3, the call processing server 110 of the group call security service providing system 100 receives the group call information including the participant terminal information and the group call tag information from the group call establisher terminal 10 , It may transmit the received group call information to the security information management server 120 to request the generation of participant distinguishing information (S320).

Then, the security information management server 120 of the group call security service providing system 100 transmits the participant distinguishing information that relatively distinguishes the participant and other participants of the group call to the group call session And the generated participant distinguishing information may be stored and managed in association with the tag information of the group call and the unique information of the corresponding participant at step S330. In this case, the generated participant distinguishing information may be serial number information allocated to each participant within the maximum number of participants of the group call.

Next, the security information management server 120 of the group call security service providing system 100 transmits the participant distinguishing information (e.g., serial number information per participant) of the group call session to the group call security service providing system 100 The call processing server 110 may request the call connection to each of the participant terminals 12, 14, and 16 at step S350. In this case, the call processing server 110 can transmit a call connection request message such as an invite message to each of the participant terminals 12, 14, and 16. In this call connection request message, Participant distinguishing information allocated to a user of the terminal (group call participant) may be included. According to the embodiment, the participant identification information may be included in any one of several other messages transmitted on the protocol procedure of the group call and transmitted to the corresponding terminal.

Next, when the call connection is accepted at the participant terminals 12, 14, 16 (S360), the group call establishment is completed and the participants including the group call establisher are made a multi-party call (S370).

The media server 130 of the group call security service providing system 100 transmits the voice received from the participant terminals 10, 12, 14, and 16 of the group call in the group call, Data can be mixed through voice codec, synchronization, etc. to generate group call data, and the generated group call data can be transmitted to the participant terminals 10, 12, 14 and 16, respectively. In this case, the media server 130 watermarks the participant identification information to each group call data transmitted to the participant terminals 10, 12, 14, and 16, and transmits the watermarked group call data to the participant terminals .

When the participant identification information and the group call data are transmitted to the participant terminals 10, 12, 14, and 16 participating in the group call, the participant terminals 10, 12, 14, An application that is software, or a microprocessor in which software and hardware are combined, and executes an audio watermarking module installed in the corresponding terminal to perform audio watermarking processing for group call security. The audio watermarking module processes the group call data received by the terminal during group call to generate a secure voice signal into which an audio mark signal is inserted, and outputs the secure voice signal to a voice output unit . In this case, the audio watermarking module 500 can generate a secure voice signal by applying various types of audio watermarking techniques. As the audio watermarking technique, there is a method of inserting (mixing) a mark signal at a specific audio data frame position in the non-audible area of an audio signal and a method of inserting an audio mark signal by changing a host sound source (Host Audio). In order to prevent leakage of a sound source file recorded with voice of a group call, watermarking information must be detected at a certain level or more even if the watermarked sound source file is modified. Therefore, a non-audible area insertion It is preferable to apply the method of changing the actual host sound source and inserting it. Various algorithms such as Low Bit Coding, Phase Coding, Spread Spectrum Watermarking, Echo Embedding, and Patchwork are introduced as a method of changing the host sound source.

An example of an audio watermarking module is shown in block diagram in Fig.

5, the audio watermarking module 500 includes a frame dividing unit 510, an FFT unit 520, a watermark inserting unit 530, a mark signal generating unit 540, a frame reconstructing unit 530, 550, and an IFFT unit 560.

First, the mark signal generator 540 can generate a mark signal for audio watermark using the participant distinguishing information received at the terminal. In this case, the mark signal generation unit 540 may convert the participant identification information into bit data, and generate a mark signal in the form of an audio signal by applying Forward Error Correction (FEC) for subsequent detection. FEC that can be applied to audio watermarking include BCH Code, RS (Reed-Solomon) Code, and Turbo Code.

The frame division unit 510 segments the host audio of the group call data into sub-frames of a predetermined length. The FFT unit 520 transforms the host audio divided into subframes into a frequency domain through Fast Fourier Transform (FFT). The watermark inserting unit 530 inserts the mark signal into the frequency domain converted signal. In this case, the watermark inserting unit 530 stores the received frequency domain signal in the buffer and inserts the audio mark information for each predetermined length. As an algorithm for inserting an audio mark signal, Phase Coding, Spread Spectrum Watermarking, and Echo Embedding may be applied. On the other hand, the watermark inserting unit 530 can transform the audio mark signal inaudibly so that the original sound is not damaged even if the audio mark signal is inserted into the audio signal of the group call. For example, when the Spread Spectrum Watermarking algorithm is applied, the watermark inserting unit 530 performs a masking process according to a psychoacoustic model in consideration of the frequency and the volume of the FFT host sound source, can do. When the watermark inserting unit 530 inserts the audio mark signal in the frequency domain, the frame reconstructing unit 550 can reconstruct the signal to the original frame length. At this time, a signal for synchronization may be inserted. The IFFT unit 560 converts the reconstructed signal data into a time-domain signal through a fast Fourier transform (IFFT) to finally generate a watermarked secure voice signal.

The generated secure voice signal is transmitted to the sound output means of the corresponding terminal, and can be reproduced with a call sound that the user of the terminal can hear.

As described above, when the media server 130 of the group call security service providing system 100 directly performs audio watermarking on group call data, the corresponding audio watermarking module is installed in the media server 130 And the participant terminals receiving the group call data can generate the secure voice signal by demodulating the audio watermarked group call data, respectively.

Meanwhile, when an outflow of the sound source file recording the group call voice through the specific participant terminal occurs, the communication terminal of the group call security service subscriber transmits the outgoing sound source file and the tag information of the group call to the group call security service providing system 100 To request the analysis of the sound source file and receive the outflow path information of the sound source file from the system 100 and display it through the display means.

FIG. 6 is a flowchart illustrating a process of analyzing a sound source file of a method of providing a group call security service according to an embodiment of the present invention. The configuration and operation of the group call security service providing system 100 shown in FIG. 2 will be described in detail with reference to FIG.

6, participants of a group call including a group call security service subscriber, for example, a group call originator, can listen to a group call by using their own communication terminals, The security service providing system 100 may be requested to analyze the sound source file leaked and may be provided with the leakage path information of the sound source file. In this case, the communication terminal of the service subscriber can be a mobile communication terminal (10, 12, 14, 16) used for group conversation by the group call participants and can separately perform data communication through a network such as a PC, As shown in FIG. In FIG. 8, the case where the communication terminal of the group call establisher corresponds to the service subscriber terminal 10 will be described as an example.

First, the service subscriber terminal 10 can request analysis of the sound source file by transmitting the sound source file recording the group call sound and the tag information of the group talk to the group call security service providing system 100 (S610 - S640). In this case, the service subscriber terminal 10 may access the group call security service providing system 100 before transmission of the sound source file and proceed with a login procedure for confirming whether the subscriber is a service subscriber.

7A to 7C show an example of a user interface screen displayed on a communication terminal when a sound source file analysis request is made.

As shown in FIG. 7A, the service subscriber terminal 10 displays a login screen through the display means 700, receives identification information such as an ID and a password from a user, and transmits the identification information to the group call security service To the system 100 (S610).

The analysis server 140 of the group call security service providing system 100 can confirm whether or not the corresponding user has joined the group call security service using the identification information received from the service subscriber terminal 10 at step S620. In this case, the analysis server 140 may compare the identification information received from the service subscriber terminal with the identification information of the service subscribers stored in the subscriber database 150, thereby confirming whether the corresponding user subscribes to the service. When the service subscription is confirmed, the analysis server 140 may request analysis information to the service subscriber terminal 10 (S630).

7B, the service subscriber terminal 10 displays an analysis information input screen through the display means 700 and displays the analyzed source file (s) stored in the storage means of the service subscriber terminal 10 And the analysis information including the tag information of the group call recorded in the sound source file, and transmits the analysis information to the group call security service providing system 100 in operation S640. In this case, the service subscriber terminal 10 displays the group call history list including the group call tag information such as the meeting name and the meeting date, and the group call participant information such as the participant name on the analysis information input screen, The group currency tag information related to the sound source file can be easily found. For example, the service subscriber selects an analysis target sound source file among the files stored in the corresponding service subscriber terminal 10 and clicks the 'commodity planning meeting 16_4_2' portion of the group call history shown in the group call history list to analyze the corresponding sound source file .

Then, the analysis server 140 of the group call security service providing system 100 may detect the participant distinguishing information watermarked in the sound source file received from the service subscriber terminal 10 (S650). In this case, the analysis server 140 may detect the participant distinguishing information from the sound source file by applying various detection techniques for detecting the audio watermarked information. The audio watermarking information detection technique is determined according to the audio watermarking algorithm and can be broadly classified into a blind method and a non-blind method. Since the security of the group call itself may be deteriorated by storing the group call content in the group call security service providing system 100, the analysis server 140 applies the blind detection method to distinguish the participant from the corresponding sound source file Information can be detected.

The analysis server 140 of the group call security service providing system 100 then transmits the group call tag information and the detected participant distinguishing information received from the service subscriber terminal 10 to the group call security service providing system 100, To the security information management server 120 (S660).

The security information management server 120 of the group call security service providing system 100 searches the unique information of the participant corresponding to the detected participant distinguishing information using the group currency tag information transmitted from the analysis server 140 (S670), and transmits the search result to the analysis server 140 (S680). In this case, the security information management server 120 compares the group currency tag information and the participant distinguishing information transmitted from the analysis server 140 with the tag information and the participant distinguishing information stored in the process of establishing the group call, The participant unique information stored in association with the participant distinguishing information can be retrieved. In this case, the participant unique information may include personal information such as the name, address, communication terminal number, etc. of the participant.

Then, the analysis server 140 of the group call security service providing system 100 receives the unique information of the participant corresponding to the detected participant distinguishing information from the security information management server 120, And provides the service subscriber terminal 10 with information as information (S690).

7C, the service subscriber terminal 10 displays the participant-specific information received from the group call security service providing system 100 through the display means 700 as the outgoing path information of the corresponding sound source file .

As described above, the call processing server 110, the security information management server 120, the media server 130, and the analysis server 140 of the group call security service providing system 100 are independent of each other Server, or may be implemented as one server in which one or more servers are physically integrated.

In addition, embodiments of the present invention can be realized by recording a computer-readable computer program on a computer-readable recording medium. When embodiments of the present invention are implemented using a computer program, the constituent means of the present invention are program code segments that perform the necessary tasks. The computer program or code segments may be stored in a computer-readable recording medium or in combination with a carrier wave and transmitted in the form of a data signal via a transmission medium or a communication network. A computer-readable recording medium includes all kinds of media for recording data that can be read by a computer system. For example, the computer-readable recording medium may include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like. In addition, the program codes may be stored or executed in a distributed manner by distributing the recording medium to a computer system connected to various networks.

As described above, according to the present invention, it is possible to allow the communication terminals performing the group call to output the group call voice in which the different information distinguishing the respective participants are watermarked, The outgoing path of the sound source file can be tracked and the security of the group call can be ensured. Particularly, it is possible to maintain or improve the basic call quality by using the participant distinguishing information which can minimize the amount of data by distinguishing participants only within the group call, such as a serial number, as the watermark information, A watermark detection rate of a high level can be ensured even when the sound source file is changed by editing or the like. In addition, by generating the participant distinguishing information for watermarking newly for each group call session and using it as watermark information of the group call, a unique information outflow problem that occurs when the fixed unique information of the participant is used as watermark information . In addition, by allowing the server side providing the group call security service and the communication terminal participating in the group call to distribute the watermarking process for watermarking information and the audio watermarking process using the participant identification information, Thereby saving computing resources and overloading the call service system that needs to process the call sessions of the call service system. Furthermore, it should be understood that the embodiments according to the present invention can solve various technical problems other than those mentioned in the specification in the related technical field as well as the related art.

The present invention has been described with reference to specific embodiments. It will be apparent, however, to one skilled in the art that various modifications may be practiced within the technical scope of the invention. Therefore, the above-described embodiments should be considered from an illustrative point of view, not from a restrictive viewpoint. That is, the scope of the true technical idea of the present invention is set forth in the appended claims, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100: Group call security service providing system 110: Call processing server
112: Group call information receiving unit 114:
116: call connection request unit 120: security information management server
122: Identification information generation unit 124: Security information storage unit
126: unique information searching unit 130: media server
140: Analysis server 142: Service subscriber identification unit
144: Analysis information receiving unit 146:
148: Outflow path information providing unit 150: Subscriber database

Claims (17)

A call processing server receiving tag information for identifying a group call together with participant terminal information participating in a group call from a group call establisher terminal and requesting establishment of a group call;
And generates participant distinguishing information for distinguishing the participant and the other participants of the group call for each participant participating in the group call for each group call session and associates the participant distinguishing information with the tag information and the unique information of the participant A security information management server; And
Wherein when the watermarked participant distinguishing information is detected in the sound source file, the unique information of the participant corresponding to the detected participant distinguishing information is stored in the sound source file, And an analysis server provided to the service subscriber terminal. The method according to claim 1,
The call processing server,
A group call information receiving unit for receiving the participant terminal information and the group call information including the tag information from the group call establisher terminal;
A distinguishing information generation request unit for delivering the group call information to the security information management server and requesting generation of the participant distinguishing information; And
And a call connection request unit for requesting call connection to the participant terminal using the participant terminal information. 3. The method of claim 2,
Wherein the call connection request unit transmits the participant distinguishing information of the participant to the corresponding terminal when a call is connected to the participant terminal. The method according to claim 1,
The security information management server includes:
A distinguishing information generating unit for generating the participant distinguishing information for each participant participating in the group call when the participant terminal information and the group call information including the tag information are transmitted from the call processing server;
A security information storage unit for storing the participant identification information in association with the tag information and the unique information of the participant; And
When the tag information of the group call recorded in the sound source file and the participant distinguishing information detected in the sound source file are transmitted from the analysis server, the security information storage unit stores the detected participant distinguishing information And a unique information retrieval unit for retrieving unique information of a participant corresponding to the group call security service. The method according to claim 1,
Wherein the participant identification information generated by the security information management server is serial number information allocated to a participant within a maximum number of participants of the group call. The method according to claim 1,
The analysis server,
A service subscriber identification unit for receiving the identification information of the service subscriber from the service subscriber terminal and confirming whether the service subscriber joins the group call security service;
An analysis information receiver for receiving analysis information including the sound source file and the tag information of the group call recorded in the sound source file from the service subscriber terminal;
A discrimination information detecting unit for detecting participant discrimination information watermarked on the sound source file; And
And transmits the detected participant distinguishing information to the security information management server, receives unique information of a participant corresponding to the detected participant distinguishing information from the security information management server, And an outflow route information providing unit for providing the outbound route information to the group call security service providing unit. The method according to claim 1,
The system further includes a media server for mixing the voice data received from the plurality of participant terminals participating in the group call to generate group call data and transmitting the group call data to the plurality of participant terminals, respectively The group call security service providing system comprising: 8. The method of claim 7,
Wherein the media server watermarks the participant identification information to the group call data, and transmits the watermarked group call data to the participant terminal. A method for providing a group call security service using a system providing a group call security service,
A call processing step of receiving the tag information identifying the group call together with the participant terminal information participating in the group call from the group call establisher terminal and requesting establishment of the group call;
The system generates per-participant distinction information for distinguishing between the participant and the other participants of the group call for each participant participating in the group call, and outputs the participant distinction information to each of the tag information and the unique information A security information management step of managing the security information in association with the security information; And
Wherein when the system is requested to analyze the sound source file recording the voice of the group call from a predetermined service subscriber terminal and watermarked participant distinguishing information is detected in the sound source file, And providing unique information to the service subscriber terminal. 10. The method of claim 9,
Wherein the method further comprises a call connection request step in which the system requests a call connection to the participant terminal using the participant terminal information. 11. The method of claim 10,
Wherein the call connection request step comprises transmitting the participant's distinguishing information of the participant to the corresponding terminal when the system makes a call connection to the participant terminal. 10. The method of claim 9,
The security information management step includes:
The system generating the participant distinguishing information for each participant participating in the group call;
Storing the participant identification information in association with the tag information and the unique information of the participant; And
When the tag information of the group call recorded in the sound source file and the sound source file is received from the service subscriber terminal and the participant distinguishing information watermarked in the sound source file is detected, And searching unique information of a participant corresponding to the detected participant identification information. 10. The method of claim 9,
Wherein the participant identification information generated in the security information management step is serial number information allocated to a participant within a maximum number of participants of the group call. 10. The method of claim 9,
Wherein the analyzing step comprises:
A service subscriber identification step of receiving the identification information of the service subscriber from the service subscriber terminal and confirming whether the service subscriber joins the group call security service;
Receiving the analysis information including the sound source file and the tag information of the group call recorded in the sound source file from the service subscriber terminal;
The system comprising: a distinguishing information detecting step of detecting participant distinguishing information watermarked in the sound source file; And
Wherein the system provides the unique information of the participant corresponding to the detected participant distinguishing information to the service subscriber terminal as the outgoing path information of the sound source file. . 10. The method of claim 9,
The method comprises the steps of: generating, by the system, voice data received from a plurality of participant terminals participating in the group call to generate group call data, and transmitting the group call data to the plurality of participant terminals, Further comprising a processing step of: 16. The method of claim 15,
Wherein the voice data processing step includes the step of the system marking the participant distinguishing information on the group call data and transmitting the watermarked group call data to the corresponding participant terminal. Delivery method. 16. A computer program for executing a method according to any one of claims 9 to 16 via a computer system, the computer program being recorded on a recording medium.

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