KR101359540B1 - Method and apparatus for transmitting data in mobile terminal - Google Patents

Abstract

The present invention relates to a data transmission method and apparatus of a mobile communication terminal, and in particular, by encrypting before transmitting multimedia data in a video call using the mobile communication terminal to ensure that the multimedia data transmitted during the video call cannot be duplicated in the counterpart terminal. A method and apparatus are disclosed.

To this end, the present invention provides a device authentication process for receiving and encrypting a universal single identifier from a counterpart mobile communication terminal during call setup, a device authentication key exchange process for exchanging a device authentication key used to encrypt the universal single identifier, and A data generation process for generating multimedia data according to a video call protocol exchanged during call setup, a data encryption process for encrypting the multimedia data, and a packet for generating a multimedia packet by combining the device authentication key with the encrypted multimedia data And a packet transmission process of transmitting the multimedia packet.

According to this, there is an advantage in that the multimedia data transmitted during the video call can be prevented from being copied in the counterpart terminal to limit the capture, storage and use rights of the multimedia data.

Universal single identifier (GUID), device authentication key, encryption, decryption

Description

Method and apparatus for transmitting data of mobile communication terminal {Method and apparatus for transmitting data in mobile terminal}

1 is an internal configuration diagram of a mobile communication terminal according to an embodiment of the present invention;

2 is a flowchart of a video call execution procedure of a first terminal according to an embodiment of the present invention;

3 is a flowchart of a video call execution procedure of a second terminal according to an embodiment of the present invention;

4 is a flowchart illustrating a signal exchange procedure between a first terminal and a second terminal according to an embodiment of the present invention.

The present invention relates to a data transmission method and apparatus of a mobile communication terminal, and in particular, by encrypting before transmitting multimedia data in a video call using the mobile communication terminal to ensure that the multimedia data transmitted during the video call cannot be duplicated in the counterpart terminal. A method and apparatus are disclosed.

With the development of mobile communication technology, mobile communication terminals are widely used, and functions of the terminals are diversifying in response to user demands.

In particular, a mobile communication terminal equipped with a high-definition camera, in addition to a simple call function, it is possible to shoot still images and videos, and to transmit the captured image file to another mobile communication terminal through a communication network.

In addition, it is possible to realize a video call function that allows the user of the terminal to talk while looking at the face using the mobile communication terminal equipped with the camera. Hereinafter, a mobile communication terminal capable of video telephony is referred to as a 'video call terminal'.

A video call system proposed for a video call between video call terminals is an IMT-2000 wireless network, and the IMT-2000 wireless network has a wideband code division multiple access (WCDMA) system and an evolution data only (EVDO) / evolution data (EVDV). and third generation and third generation wireless networks.

In the video call system, terminals in a video call exchange multimedia data packets through the wireless network, and the H.245 protocol is used to control transmission of packet data. The H.245 protocol defines control messages for mediating performance and channel between terminals. Through these control messages, the capability exchange, the opening and closing of a logical channel, and the mode preference request are performed. request, flow control and command.

In addition, the H.245 protocol is responsible for negotiation (negotiation) and quality of service (QoS) control for compatibility between terminals. This QoS control type has functions such as frame / bit rate adjustment, image size adjustment, fast update request, and the like.

In the video call system, when the mobile communication terminal user makes a phone call with the other party, the sender video is compressed and transmitted by the sender terminal, and the receiver terminal decodes the compressed other party video into the original video and displays it on the display unit.

In addition, the video call system provides a function of making a call while viewing the other party in real time. In addition, the video call system provides a function of transmitting a video file stored in the mobile communication terminal to the other party through a multimedia message service (MMS).

In particular, in consideration of the user's aspect, there is a desire to store the appearance of the other party in real time during a video call, and in fact, a function for storing the image transmitted from the other party's terminal during the video call has been proposed in real time.

As such, when a video call terminal is provided with a function of storing a sender image during a video call, a problem arises in that the sender image can be stored, reused or distributed freely by the receiver without permission of the sender. For example, the received image can be moved to a data storage device such as a computer, and can be copied, edited, and distributed through an internet network. However, since the sender has the right to the sender or the multimedia contents created by the sender, the other party must obtain permission from the sender of the video data in order to capture the video during the video call.

However, referring to a process of receiving permission of an image data sender for capturing an image during a conventional video call, there is only a process of generating a capture request screen on the counterpart display unit when a capture command key for capturing the received image is input. Once the call setup for the video telephony is made and the received video is displayed on the display unit of the receiving terminal, a capture request screen is generated on the transmitting mobile terminal according to the performance of the receiving mobile communication terminal. There is a problem in that the received image can be captured without the need.

Accordingly, an object of the present invention is to provide a method and apparatus for encrypting multimedia data transmitted during a video call so as to prevent unauthorized copying at a counterpart terminal in a video call using a mobile communication terminal.

Another object of the present invention is to provide a method and apparatus for restricting capture, storage, and usage rights of a multimedia data of a counterpart during a video call in a mobile communication terminal.

The data transmission method of the mobile communication terminal of the present invention for achieving the above object, the device authentication process for receiving and encrypting a universal single identifier from the other party's mobile communication terminal when the call is set up, and used to encrypt the universal single identifier A device authentication key exchange process for exchanging a device authentication key, a data generation process for generating multimedia data according to a video call protocol exchanged during the call setup, a data encryption process for encrypting the multimedia data, and the encrypted multimedia And a packet generation process of generating a multimedia packet by combining the device authentication key with data, and a packet transmission process of transmitting the multimedia packet.

In addition, the data transmission apparatus of the mobile communication terminal of the present invention for achieving the above object, stores a device authentication key having an encryption key for encrypting arbitrary data and a decryption key for decrypting the encrypted data; A device authentication key management unit for extracting a device authentication key included in the received multimedia packet using the device authentication key, a data encryption unit for encrypting multimedia data to be transmitted according to the video call protocol, and decrypting the encrypted multimedia data A data decryption unit configured to combine the device authentication key with the encrypted multimedia data, a packet generation unit generating a multimedia packet, and an authority attribute for the multimedia data received from a counterpart terminal and managing the multimedia data with the authority attribute. Capture packets based on Contains wealth.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The mobile communication terminal according to an exemplary embodiment of the present invention may include a photographing function, a mobile communication function, a digital broadcasting reception function or an information processing function.

1 is an internal configuration diagram of a mobile communication terminal according to an embodiment of the present invention. The mobile communication terminal illustrated in FIG. 1 includes a display unit 101, a memory unit 102, a key input unit 103, an audio processing unit 104, an RF unit 105, a data processing unit 106, and a control unit 110. The control unit 110 includes a device authentication key management unit 111, a data encryption unit 112, a data decryption unit 113, a packet generation unit 114, and a packet capture unit 115.

The display unit 101 displays an image according to the execution of the multimedia file on the screen. The memory unit 102 may store a system file and a large multimedia file for operating the mobile communication terminal. The key input unit 103 is provided with keys for receiving a predetermined telephone number including numeric and text information, and function keys for setting various functions. The audio processor 104 reproduces a received audio signal output from the audio codec of the data processor 106 or transmits a transmission audio signal generated from the microphone to the audio codec of the data processor 106.

The RF unit 105 performs a wireless communication function of the mobile communication terminal. The RF unit 105 includes an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying and downconverting a received signal. The data processor 106 includes a transmitter for encoding and modulating the transmitted signal, a receiver for demodulating and decoding the received signal, and the like.

The controller 110 performs a function of controlling the overall operation of the mobile communication terminal. The control unit 110 is connected to the display unit 101, the memory unit 102, the audio processing unit 104, the data processing unit 106 in accordance with an embodiment of the present invention to exchange, process, process data, call ( call).

The device authentication key management unit 111 stores a device authentication key including an encryption key for encrypting arbitrary data transmitted and received by the mobile communication terminal and a decryption key for decrypting the encrypted data, and establishes a call. Encrypt the universal single identifier received from it. The device authentication key included in the multimedia packet is extracted by comparing the received device authentication key with the multimedia packet. The device authentication key is set by a terminal manufacturer or a communication provider.

The data encryption unit 112 encrypts multimedia data to be transmitted according to the video call protocol. The data decryption unit 113 decrypts the encrypted multimedia data using the extracted device authentication key.

The packet generation unit 114 combines the device authentication key with the encrypted multimedia data to generate a multimedia packet. The packet capture unit 115 manages rights attributes for multimedia data received from the counterpart terminal and captures the multimedia data according to the rights attributes. The rights attribute includes whether to allow capturing of audio data, still image data, and video data, and rights to play, edit, or transmit the captured data.

2 is a flowchart illustrating a video call execution procedure of a first terminal according to an embodiment of the present invention. In FIG. 2, the first terminal assumes a case of transmitting audio and video during a video call, and will be described based on data generation and transmission processes.

In step S 201, the controller 110 checks whether a call setup command key input or a call setup request is received. If it is determined that there is a call setup command key input or call setup request, it is checked in step S203 whether an encryption command key has been entered. The encryption command key may be a specific number of predetermined digits added after the counterpart phone number, or may be a specific shortcut key set by the terminal user. Call setup is made in step S205. As described above, in the present invention, call setup is performed by inputting an encryption command key after a call setup command key input or a call setup request.

In step S207, the controller 110 checks whether a universally unique identifier (hereinafter, referred to as a GUID, Globally Unique Identifier) has been received. The GUID is a 128-bit number used to identify each mobile communication terminal in a communication network. Each GUID has a unique GUID, and when a call is set up, each terminal exchanges its own GUID.

In step S 209, when receiving the GUID, the device authentication key management unit 111 of the controller 110 encrypts the GUID using a device certificate key. The device authentication key is set by a terminal manufacturer or a communication service provider and stored in the device authentication key management unit 111 of the controller 110, and includes an encryption key for encrypting arbitrary data and a decryption key for decrypting the encrypted data. It is done by Therefore, when the encrypted GUID is combined with the multimedia data transmitted during the video call, the encrypted GUID can be decrypted only by the device authentication key, and the multimedia data can be executed only by removing the decrypted GUID. When the GUID is encrypted, in step S211, each terminal exchanges the device authentication key.

In step S213, the mobile communication terminals that have established the call exchange video call protocols with each other. Accordingly, based on the video call protocol, in step S 215, audio data and video data are generated. In the present invention, the mobile communication terminal can generate audio data and video data during a video call using a camera and a microphone.

In step S 217, the data encryption unit 112 of the controller 110 encrypts the audio data and the video data using the device authentication key. In operation S 219, the controller 110 multiplexes the encrypted audio data and the video data to generate multimedia data. Subsequently, in step S 221, the packet generation unit 114 generates the multimedia packet by combining the encrypted GUID with the multiplexed multimedia data. In the video call according to the present invention, the multimedia packet is transmitted in step S223.

Meanwhile, at the same time as the multimedia packet is transmitted to the counterpart terminal, it is checked whether a capture permission request message is received from the counterpart terminal in step S225. The capture permission request message is displayed on the video call screen of the counterpart terminal. While the request message is displayed, capture permission conditions such as whether to use capture, capture allowance time, playback count, playback period, copying, editing, retransmission, etc. are displayed. In step S227, when the capture permission condition is input and set through the key input unit 103, the capture permission condition and the response message are transmitted to the counterpart terminal according to a response message transmission command indicating whether capture is allowed.

3 is a flowchart illustrating a video call execution procedure of a second terminal according to an embodiment of the present invention. In FIG. 3, the second terminal assumes that a voice and a video are received during a video call, and will be described based on data receiving, playing, and capturing processes.

In step S301, the controller 110 checks whether a call setup command key input or a call setup request is received. In step S303, it is checked whether an encryption command key is input. Accordingly, call setup is made in S305. In step S 307, the controller 110 checks whether a universal single identifier (GUID) has been received. In step S309 it is checked whether the device authentication key has been received. In the state of call setting, when receiving a GUID and receiving a device authentication key, each mobile communication terminal exchanges a video call protocol in step S 311.

In step S313 it is checked whether the multimedia packet is received. The multimedia packet is multimedia content consisting of audio data and video data. When the multimedia packet is received, in operation S 315, the device authentication key manager 111 extracts the GUID encrypted using the device authentication key from the multimedia packet. Thereby, multimedia data composed of audio data and video data encrypted by the device authentication key is obtained. The data decryption unit 113 decrypts the encrypted audio data and the video data using the device authentication key. Accordingly, the audio data and the video data can be reproduced in step S317.

The audio data and the video data are reproduced to check whether there is a capture command key input in step S319 during a video call. When the capture command key is input, the multimedia data receiving terminal in step S 321

Send a capture request message to the opposite terminal. In step S323 it is checked whether a capture permission message has been received. When receiving the capture permission message in step S 325, the packet capture unit 115 captures the multimedia data running in the video call by using the permission message and the device authentication key. When the capture command is set to be read by the controller 110 only when the permission message signal is combined with the device authentication key, the multimedia data being reproduced can be captured only by receiving the permission message signal. In operation S 327, when the capturing operation is completed, the multimedia data receiving terminal transmits a capture completion message to the counterpart terminal.

4 is a flowchart illustrating a signal exchange procedure between a first terminal and a second terminal according to an embodiment of the present invention. Based on the description of FIG. 2 and FIG. 3, the signal exchange procedure between the two terminals will be described.

During the video call, in step S401, call setup is attempted by receiving a call setup command or call setup request. In step S403, the terminal user completes call setup by inputting an encryption command key. Therefore, in the present invention, a data encryption procedure is essentially performed to make a video call.

In step S405 both terminals exchange a universal single identifier (GUID). The GUID is a unique number for identifying the terminal. The device authentication key is exchanged in step S407. The device authentication key is composed of a public key (public key (encryption key)) and a private key (private key, decryption key), provided by the terminal manufacturer or a communication provider, and receives a new device authentication key through a communication network to be changed Can be.

In step S 409, the first terminal and the second terminal exchange protocol signals for a video call. In the present invention, the protocol is assumed to be H.245 protocol.

After exchanging protocol signals for video calls, both terminals start a video call and transmit and receive multimedia packets in step S 411. The multimedia packet is generated by combining the multimedia data with a GUID encrypted using the device authentication key. In addition, the multimedia data is configured by multiplexing the encrypted audio data and video data using the device authentication key.

In step S413, both terminals start a video call by decoding and playing the received multimedia packet of the other party. The multimedia packet is multimedia content composed of video and audio data of the other party, and any multimedia file stored in the terminal or relayed through the terminal may be encrypted and transmitted during the video call.

In operation S 415, if one terminal inputs a multimedia content capture command key during a video call, a capture permission request message is transmitted to the other terminal. The capture permission request message is displayed on the video call screen of the counterpart terminal. Along with the request message being displayed, capture permission conditions such as capture allowance time, playback count, playback period, copying, editing, retransmission, etc. are displayed.

In step S417, the terminal user who allows capture transmits a capture response message by setting the capture permission condition.

In step S419, the terminal receives the capture permission message and receives the capture permission message and captures the multimedia data running in the video call using the capture permission message and the device authentication key. When the capture command is set to be read by the controller 110 only when the permission message signal is combined with the device authentication key, the multimedia data being reproduced can be captured only by receiving the permission message signal.

In operation S 421, when the capturing operation is completed, the multimedia data receiving terminal transmits a capture completion message to the counterpart terminal.

In the above-described embodiment of the present invention, a call setup for a video call is made and multimedia data is decoded and played. However, in another embodiment of the present invention, a capture permission request message is transmitted and captured for the call. This includes the case where multimedia data can be played only after receiving the permission message.

As described above, in a video call, encryption information is combined and transmitted to a multimedia packet configured by multiplexing encrypted video and audio data, and the video and audio data cannot be reproduced or captured unless a capture permission message is received. Accordingly, unauthorized copying of multimedia data transmitted during a video call can be prevented.

As described above, preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. Modifications, substitutions or additions may be made.

According to the present invention, there is an advantage that the multimedia data transmitted during the video call cannot be copied in the other party's terminal by encrypting before transmitting the multimedia data during the video call using the mobile communication terminal.

In addition, there is an advantage that can limit the capture (capture), storage and use rights for the multimedia data transmitted during the video call in the mobile communication terminal.

Claims (10)

In the data transmission method between terminals having a video call function, The first terminal is a device authentication process for encrypting the universal single identifier received from the second terminal using the device authentication key when establishing a call with the second terminal, Transmitting, by the first terminal, the device authentication key used to encrypt the universal single identifier to the second terminal; The first terminal generates a data for generating multimedia data according to a video call protocol exchanged during the call setup; The first terminal encrypts the multimedia data using the device authentication key; The first terminal generates a multimedia packet by combining the encrypted multimedia data and the encrypted universal single identifier; The first terminal comprises a packet transmission process for transmitting the multimedia packet to the second terminal. The method according to claim 1, The second terminal receiving the device authentication key and the multimedia packet; Extracting, by the second terminal, the universal single identifier from the multimedia packet using the device authentication key; Obtaining the encrypted multimedia data from the multimedia packet by the general purpose single identifier extraction; The second terminal further comprises the step of decrypting and playing the encrypted multimedia data using the device authentication key. 3. The method of claim 2, The second terminal displaying the decoded multimedia data; Transmitting, by the second terminal, a capture request message to the first terminal upon inputting a capture command key for the displayed multimedia data; The second terminal further comprises the step of capturing the displayed multimedia data using the device authentication key when receiving the acceptance message for the capture request. The method of claim 1, wherein the call setup, And a data encryption command key is input after a call setup command key input or a call setup request is received. The method of claim 1, wherein the device authentication key, An encryption key for encrypting arbitrary data and a decryption key for decrypting the encrypted data. delete delete delete In the data transmission device between terminals having a video call function, A device authentication key management unit for storing a device authentication key having an encryption key for encrypting arbitrary data and a decryption key for decrypting the encrypted data, and extracting a universal single identifier from a received multimedia packet using the device authentication key; A data encryption unit for encrypting multimedia data to be transmitted according to a video call protocol using the device authentication key; A data decryption unit which decrypts and reproduces the encrypted multimedia data extracted from the multimedia packet using the device authentication key; A packet generation unit for generating a multimedia packet by combining the encrypted multimedia data and the extracted universal single identifier; And a packet capture unit which manages the rights attribute for the multimedia data received from the counterpart terminal and captures the multimedia data according to the rights attribute. 10. The method of claim 9, The authority attribute may include a right to capture audio data, still image data, and moving image data, and a right to play, edit, or transfer the captured data.

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