KR101538713B1 - A method of supplying contents service based on multi-session and system of that - Google Patents

Abstract

The present invention relates to a method for performing a multisession-based data service to a terminal client in a system including a content server performing a content providing service, Receiving a group content service request message including a valid count parameter indicating a number of unserviced content among a plurality of requested contents, receiving a group content service request message including a shared encryption key to be used for a process on a plurality of content data based on the multi- And performing a transmission process for each of the plurality of content data using the shared encryption key information.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and a method for providing a multi-session based content service,

The present invention relates to a system and a method for providing a multisession-based content service, and more particularly, to a system and a method for providing multisession-based content by sharing an encryption key in a multisession-based content service provision process .

With the growth of the Internet and the development of multimedia technology, it becomes easier to distribute and acquire digital contents, and illegal distribution of digital contents and copyright protection of digital contents are emerging.

Digital Rights Management (DRM) is a technology that protects the owner's copyright and protects the consumer from unauthorized use of content, including secure distribution and dissemination of content and content-controlled content control. DRM permits unlimited access to any encrypted digital content, but requires a license to decrypt and play back the encrypted digital content. Therefore, by applying DRM, digital contents can be protected effectively.

The functions of DRM can be roughly divided into the protection of digital contents, the management of usage rules, and the management of billing system. By the technology of DRM, digital contents can be distributed illegally through all processes from generation to distribution, Or protected by an encryption process to prevent illegal use. In addition, DRM allows only legitimate users with cryptographic keys to decrypt and use the encrypted content, and protects the content by making it illegal to use it if it does not exist.

Therefore, in order to secure information security for digital contents to be served and users who use the service, SSL (Secure Sockets Layer) or various encryption transmission methods are continuously studied in the communication between client and server.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and system for providing content data in a communication service in which a plurality of contents are collectively provided, do.

Another object of the present invention is to solve the problem of abuse of encryption key information that can be generated in the process of providing a plurality of content services using the same encryption key information.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a method of providing a multi-session data service to a terminal client in a system including a content server for providing a content providing service, Receiving a group content service request message including a multisession download indicator indicating whether a service request is requested and a valid count parameter indicating a number of unserviced contents among a plurality of requested contents; Generating shared encryption key information to be used for a process on a plurality of content data based on the multisession download indicator; And performing a transmission process for each of the plurality of content data using the shared encryption key information.

The method of performing a multi-session based data service according to an exemplary embodiment of the present invention may further include storing the valid count parameter included in the received group content service request message.

According to another aspect of the present invention, there is provided a method of performing a multi-session based data service, the method comprising: transmitting the shared encryption key information to the terminal client; And receiving the service-specific service request message from the terminal client. The service-specific service request message may include detailed information for each content encrypted based on the encryption key information in the terminal client.

The step of performing the plurality of content-based transmission processes may further include determining whether to use the shared encryption key information based on the predetermined encryption key sharing valid time and the valid count parameter.

In addition, when determining to use the shared encryption key information according to an embodiment of the present invention, a method of performing a multi-session based data service according to an embodiment of the present invention may include Decrypting the encrypted detailed information for each content using the shared encryption key information; And transmitting the content data corresponding to the content-based service request message to the terminal client.

Furthermore, the method of performing a multi-session based data service according to an exemplary embodiment of the present invention may further include changing and storing the value of the valid count indicator sequentially decremented.

On the other hand, when at least one of the encryption key sharing valid time and the valid count parameter expires according to an embodiment of the present invention, a method of performing a multi-session based data service according to an embodiment of the present invention includes: And invalidating the information.

According to another aspect of the present invention, there is provided a system for providing a multi-session based communication service, the system including a content server for serving a plurality of content data to a terminal client of the user according to a user request, The content server receives a multi-session download indicator indicating whether a plurality of content data services are requested from the terminal client and a group content service request message including a valid count parameter indicating the number of unserviced content among a plurality of requested content Generates a shared encryption key information to be used for a process related to a plurality of pieces of content data based on the multisession download indicator, and transmits a transmission process for each of the plurality of content data using the shared encryption key information It can be performed.

The content server according to an embodiment of the present invention includes a client interworking unit for interfacing with the terminal client to perform signal transmission / reception with the terminal client; A processor for generating the shared encryption key information and performing a transmission process for each of the plurality of pieces of content data; And a parameter storage unit for storing the valid count parameter included in the received group content service request message.

Also, the content server according to an embodiment of the present invention transmits the shared encryption key information to the user terminal using the client interworking unit, and transmits the encrypted content key to the user terminal based on the encrypted content key And receive the service-specific service request message including the detailed information.

The processor may further include a comparison operation unit for determining whether to use the shared encryption key information based on a predetermined encryption key sharing valid time and the valid count parameter.

The processor may further include a decryption unit for decrypting the encrypted content-based detailed information included in the received content-based service request message using the shared encryption key information.

Meanwhile, when using the shared encryption key information in the comparison operation unit according to an embodiment of the present invention, the processor may change and store the value of the valid count indicator stored in the parameter storage unit so as to sequentially decrease .

Alternatively, when the comparison operation unit determines that at least one of the encryption key sharing valid time and the valid count parameter has expired, the processor may invalidate the encryption key information stored in the parameter storage unit.

According to another aspect of the present invention, there is provided a terminal client using a multisession-based communication service, the terminal client including: a server interlocking unit operable to interoperate with a content server providing a multisession-based communication service; A user input unit for inputting request information for a plurality of content services according to a user request; And a controller for generating a group content service request message in association with the plurality of content service requests input by the user input unit and transmitting the group content service request message to the content server through the server interworking unit .

Here, the controller according to an exemplary embodiment of the present invention may include a multi-session download indicator indicating whether a plurality of content data services are requested in the group content service request message and a validity count indicating a number of unserviced content among the plurality of requested content Parameters can be created and included.

The terminal client according to an embodiment of the present invention may further include a memory unit for storing shared encryption key information to be used in a process on the plurality of content data received from the content server through the server linkage unit.

At this time, the control unit according to an embodiment of the present invention can encrypt detailed service request related information for each of the plurality of contents based on the shared encryption key information, and transmit the encrypted detailed information to the contents server.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention by those skilled in the art. And can be understood and understood.

According to the present invention, since a plurality of content processes can be performed using the same encryption key information, an encryption key is generated for each conventional content and a signaling process for sharing encryption key information between the content server and the terminal is performed. Thereby simplifying the overall service process and shortening the service delivery time.

In addition, according to the present invention, it is possible to solve the problem of abuse of the encryption key information that can be generated using the same encryption key information in the process of providing a plurality of content services.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a block diagram illustrating a system for providing a multi-session based content service according to an embodiment of the present invention.
2 is a block diagram illustrating an example of a client configuration to which an encryption key sharing method is applied in a multi-session-based system according to the present invention.
FIG. 3 is a block diagram illustrating an example of a content server configuration to which an encryption key sharing method is applied in a multi-session-based system according to the present invention.
4 is a diagram illustrating an example of a signal transmission / reception process between a client and a content server according to an embodiment of the present invention.
5 is a diagram illustrating an example of a process of providing a plurality of contents based on a multi-session in accordance with an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

In recent years, in order to secure the security of digital contents and user information, SSL or various encryption transmission methods are used for communication between client and server. In such an environment, when a user uses a service based on a plurality of service sessions through a single terminal, a method of applying an independent encryption key for each service session currently used includes a method of sharing a plurality of session- Problems such as waste of communication bandwidth, increase of signal load, or deterioration of service quality occur.

Accordingly, the present invention provides a system and method for sharing an encryption key in a multi-session based content service environment capable of performing content protection while sharing a cryptographic key in a case of a plurality of session-based services, .

1 is a block diagram illustrating a system for providing a multi-session based content service according to an embodiment of the present invention.

Referring to FIG. 1, a system according to an exemplary embodiment of the present invention includes a client 200 used by a user to download content, a content server 300 that transmits a plurality of contents to a client according to a content service request received from the client 300 ). The client 200 described in the present specification is used in the same meaning as a terminal and may be a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (personal digital assistant), a portable multimedia player (PMP) ), Navigation, and the like.

Generally, the client 200 using the content service and the content server 300 providing the service share SSL-based encryption key information before transmitting the content data. In this case, when the user requests a plurality of contents to be transmitted collectively, the contents server 300 generates an encryption key for each session and transmits the encryption key to the user's client 200, thereby increasing the data load, Waste of resources occurs.

Therefore, the client 200 and the content server 300 according to an embodiment of the present invention shown in FIG. 1 use a method of reusing a generated encryption key when a user requests a service of a plurality of contents at once. That is, when a plurality of contents are requested to be provided from the client 200, the content server 300 generates an encryption key, shares it with the client 200, and reuses the shared encryption key to proceed the process for each content.

To this end, the client 200 transmits a request message for a plurality of content service requests to the content server 300, and performs a request for providing an encryption / decryption key. The client 200 includes a multi-session download indicator (MSI) To the content server 300, an encryption key request message including a count value (Valid Count: VC) parameter.

In this specification, a multisession download indicator (MSI) is defined as an indicator for indicating whether to request a multisession download, and a valid count parameter (Valid Count: VC) is defined as content number information requested by a user.

The content server 300 uses the same encryption key in the transmission process for each of a plurality of contents based on the multisession download indicator (MSI) and the valid count parameter (VC) included in the request message transmitted from the client 200 And it is possible to prevent the problem of abuse / misuse of content data that may occur in the process.

Hereinafter, the components constituting the system according to an embodiment of the present invention shown in FIG. 1 will be described in order.

2 is a block diagram illustrating an example of a client configuration to which an encryption key sharing method is applied in a multi-session-based system according to the present invention.

2, the client 200 includes a wireless communication unit 210 for performing data communication with the content server 300, an information input unit 220 for generating input data for user's operation control of the terminal, A control unit 230 for processing the information input through the input unit 220 and performing a process of encrypting and transmitting the information to the content server 300, a memory 240 for storing data, and an output unit 250 .

The wireless communication unit 210 may include one or more modules that enable wireless communication between the client 200 and the wireless communication system or between the content server 300 and the wireless communication system.

The information input unit 220 may include an audio / video (A / V) input unit 221 for inputting an audio signal or a video signal, and a user input unit 223 for generating input data for user operation control of the terminal . As an example of the operation of the user input unit 223, the user can input a message requesting a plurality of contents through a UI (User Interface) using a predetermined application.

The control unit 230 includes an information processing unit 231 for receiving and processing the information input through the information input unit 220, information processing unit 231 for encrypting the processed information or the input information data for the complementary problem in the process of transmitting the processed data, A service processing unit 235 for performing a function of processing the biz logic, and a server interworking unit 237 for interworking with the content server 300. [

The information processing unit 231 may process the input data requesting a plurality of contents based on the multisession input through the user input unit 223 into a form suitable for linking with the contents server according to the information transmission standard. Specifically, the information processing unit 231 generates a message including a multisession download indicator (MSI) and a valid count parameter (VC) based on a plurality of content request data input through the user input unit 223, According to the standard, it can be processed in a form suitable for linking with a content server.

The processed request message is transmitted to the encryption processing unit 233, and the encryption processing unit 233 encrypts the customer information and key information that require encryption, and performs an operation of processing key information necessary for encryption.

The encrypted content request message is transmitted to the content server 300 through the wireless communication unit 210 and the server interlock unit 237 performs a function of providing interoperation between the client 200 and the content server 300 do.

The memory 240 may store a program for processing and controlling the controller 230, and may perform functions for temporarily storing input / output data. In the case where the client 200 uses the content service provided by the predetermined content server 300 according to the user input information, the client 200 may transmit the policy data related to the content providing service received from the content server 300, And store the generated and transmitted encryption key information. When the encryption key information is shared between the client 200 and the content server 300, the controller 230 can use the encryption key derived from the memory 240 in the data receiving process for each of the plurality of contents have.

The output unit 250 is for generating an output related to a visual, auditory or tactile sense. The output unit 250 may include a display unit, an audio output module, an alarm unit, and the like.

The display unit may display information processed by the client 200 in a UI (User Interface) or GUI (Graphic User Interface) format. As an example of the use of the UI, the user can select a plurality of contents based on the multisession through the UI displayed on the display unit. The information on the selected plurality of contents is transmitted to the controller 230, is included in the predetermined request message, and is transmitted to the server 300. In this case, the display unit can be used as an input unit for the user to input information.

FIG. 3 is a block diagram illustrating an example of a content server configuration to which an encryption key sharing method is applied in a multi-session-based system according to the present invention.

3, the contents server 300 includes a client interworking unit 310 for interworking with one or more clients 200, an encryption / decryption unit 320 for generating encryption key information with respect to content service provision, A parameter storage unit 330 for storing essential parameters used for sharing an encryption key with the client 200, and a function for interfacing with the infrastructure to perform basic functions such as billing / authentication And a service infrastructure interworking unit 340. [

The processor 320 includes a decryption processing unit 321, an information receiving unit 323, a comparison / operation unit 325, and a biz logic unit 323 for performing processes up to providing content data to a plurality of clients requesting a content service. And a service processing unit 327 that performs a service.

The processor 320 generates data including encryption key information and the like to prevent data loss that may occur in the transmission process with respect to the content data to be transmitted to the clients. In addition, a process for data received from the client 200 is performed.

Specifically, the decryption processing unit 321 decrypts the encrypted information received from the client 200 based on a predetermined encryption algorithm, and converts the decrypted information into a form necessary for the service provided by the content server 300. [

The information receiving unit 323 separates information required to be compared / computed among the decrypted information received from the decryption processing unit 321. [ For example, when a message received from the client 200 includes a multisession download indicator (MSI) and a valid count parameter (VC), information on the message is transmitted to the comparison / operation unit 325.

The comparing / calculating unit 325 performs comparison / calculation according to a predetermined shared information management policy with respect to the information transmitted from the information receiving unit 323. For example, when a plurality of content service providing processes share encryption key information generated according to a content request message received from a client, the comparison / operation unit 325 compares the multisession download indicator (MSI) included in the message, And compares / calculates the effective count parameter (VC) with the effective time to be applied when the encryption key is shared according to the predetermined shared information management policy to determine the validity of the encryption key sharing.

The parameter storage unit 330 may store essential parameters used for sharing the same encryption key information in a process of servicing a plurality of content data requested by the authenticated client 200. [ For example, it is possible to store the multisession download indicator (MSI) and the valid count parameter (VC) included in the request message received from the client 200, or to store the encryption key information shared by the comparison / The valid time information can be stored.

The service infrastructure interworking unit 340 may perform a function of interworking with an infrastructure to perform basic functions such as billing / authentication.

4 is a flowchart illustrating a signal transmission / reception process between the client 200 and the content server 300 for sharing the same encryption key in each content service process in order to provide a plurality of content services based on the multisession according to the present invention. .

4 is a diagram illustrating an example of a signal transmission / reception process between a client and a content server according to an embodiment of the present invention. Specifically, in order to use a plurality of content services based on a multi-session, the client 200 according to an exemplary embodiment of the present invention assumes a state of accessing the content server 300 through a predetermined authentication step.

Referring to FIG. 4, the client 200 generates a Secure Sockets Layer (SSL) -based request message for a plurality of content providing requests according to a user input signal and transmits the request message to the content server 300 in operation S401.

At this time, the content request message generated by the controller 230 of the client 200 may include a multisession download indicator (MSI) and a valid count parameter (VC).

The Multisession Download Indicator (MSI) indicates whether it is a single content download or two or more content downloads. For example, when the MSI is set to 1 bit, it can be set to indicate a single content request when the bit value is '0' and a plurality of content requests when the bit value is '1' . In the present invention, it is assumed that the definition of the value indicated by the multisession download indicator (MSI) is predefined in both the client 200 and the content server 300.

The effective count parameter (VC) indicates the number of contents that the user wants to download or service. For example, when the user desires to download 8 sound files, the bit value of the effective count parameter VC can be set to indicate 8.

 The processor 320 of the content server 300 generates encryption key information to be used in the content data transmission process with the client 200 based on the content request message received from the client 200 in the previous step S401 ).

The processor 320 of the content server 300 stores the valid count parameter VC included in the request message in the parameter storage unit 330 when the multisession download indicator MSI indicates a plurality of content requests (S403).

The content server 300 transmits the generated encryption key information to the client 200 in step S404 and the client 200 stores the received encryption key information in the memory 240 in step S405. Accordingly, the client 200 and the content server 300 can decrypt the encrypted information in the content server 300 by sharing the same encryption key information thereafter. The client 200 can reuse the encryption key information provided from the content server 300 in the previous step to encrypt the related information for requesting each of the plurality of contents.

Then, the client 200 encrypts detailed content service related information (e.g., user information and / or payment information) based on the encryption key information for each of a plurality of contents to be requested (S406) And transmits a content request message including relevant detailed information to the content server 300 (S407).

The content server 300 determines whether to use the encryption key information shared with the client 200 in order to decrypt the encrypted detailed information included in the content request message received from the client 200 at step S408.

At this time, the content server 300 determines whether to reuse the encryption key information in consideration of the effective count parameter VC and the encryption key information effective time stored in the parameter storage unit 330 as an example of the determination of the re- . In the specification of the present invention, the encryption key information sharing effective time is a time required for a process of providing a plurality of requested content data in consideration of the capacity, the number of contents, Or defined as predetermined information.

In step S408, it is determined whether the valid count parameter VC satisfies all of the contents requested by the client 200 that are not provided with the service (VCI > 0) and the encrypted key information effective time has not elapsed The processor 320 derives the encryption key information stored in the parameter storage unit 330 to decrypt the content request related detailed information transmitted from the client 200 and performs a process for providing the requested content data S409).

The processor 320 may also be configured such that each time the encryption key information is reused to decrypt the information received from the client 200, the number at which the valid count parameter VC stored in the parameter storage 330 is counted down sequentially Can be updated.

In operation S410, the content server 300 may provide the requested content data to the client 200 according to the activation of the service infrastructure interworking unit 340 based on the related detailed information for requesting the decrypted content.

Meanwhile, if at least one of the valid count parameter (VC) and the validity time does not match the condition, the content server 300 may invalidate the encryption key information and stop the content data service (S411).

Although the present invention is not limited to the process shown in FIG. 4, by reusing the encryption key information in the content server 300 according to the exemplified process, unnecessary interworking and time can be avoided in a process of downloading a plurality of contents or linking services User satisfaction can be increased. In addition, the content server 300 determines whether the encryption key information is reused in consideration of the valid count parameter (VC) and the encryption key information sharing effective time, and thereby, the data abuse / It is possible to prevent problems such as leakage and loss.

5 is a diagram illustrating an example of a process of providing a plurality of contents based on a multi-session in accordance with an embodiment of the present invention.

Referring to FIG. 5A, a user may configure a service scenario for collectively processing download services for a plurality of contents (S501). As an example of this, a service user can construct a service scenario for requesting service provision (e.g., adding a cart or downloading) a plurality of pieces of content data as shown in FIG. 5 (b).

The terminal client transmits a message requesting a plurality of content services based on the service scenario according to the user input signal to the server (S502). As shown in FIG. 5B, when a user creates a service scenario in which a total of eight pieces of content are downloaded collectively, the terminal client sends a 'Multisession Download Indicator (MSI) = Yes' (VC) = 8 'to generate a content request message.

In the content server, if the MSI indicates more than one content request, the content server stores 'valid count parameter (VC) = 8' information included in the request message received in the previous step (S502) (S503).

The content server transmits the encryption key information to the terminal client so that the server and the client can share the encryption key information generated in the previous step (S504).

The client stores the received encryption key information and sequentially encrypts detailed information for content request based on the encryption key information for a unit service for a total of eight sound source data requesting service reception. Accordingly, the client encrypts the detailed information for the content request for the first content (S505), and transmits the request message for the first content including the encrypted detailed information to the content server (S506) .

The content server decides whether to decrypt the detailed information using the encryption key information generated in step S503 based on the received first content request message (S507). As an example of a method of determining whether to use the encryption key, it is determined whether the encryption key information can be reused by driving the effective count parameter (VC) value and the encryption key sharing effective time counter. The encryption key sharing validity period may be arbitrarily set based on the total data amount of a plurality of contents requested by the content server, or may be set by a system implementer from the outside separately.

If the use of the encryption key information is valid, the content server decrypts the detailed information that has been requested from the client using the encryption key information, and saves and stores the valid count parameter (VC) (S508). The service of the first music among the service requests for a total of eight tunes is performed, so that the effective count parameter VC can be updated from 8 to 7. [

The content server transmits the requested first content data to the client (S509).

Next, the client reuses the encrypted key information received and stored in the previous step (S504) to encrypt the detailed information for the content service request for the second music (S510), and transmits the second content containing the encrypted detailed information And transmits an opposite service request message to the content server (S511).

In operation S512, the content server determines whether to reuse the encryption key information generated in the previous step S503 based on the second content request message. Similarly, the determination as to whether or not the encryption key is reused determines whether the encryption key information can be reused by driving the valid count parameter (VC) value and the encryption key sharing valid time counter.

When it is determined to reuse the encryption key information, the encryption key information is reused to decrypt the detailed information included in the second content request message, and the valid count parameter (VC) is changed and stored (S513). In this case, the valid count parameter VC may be changed from 7 to 6 and stored.

Thereafter, the content server transmits the second content data to the client (S514).

If at least one of the effective count branch director (VCI) = 7 and the validity time is invalid, the encryption key information is invalidated (S515) and the service is terminated (S516)

As the steps S505 to S514 are repeatedly performed, the client transmits detailed information (e.g., user information and / or approval information) for each of the eight songs for the unit service on the sound source data of the eight songs requesting the data service Encryption key information can be reused and encrypted. Also, the content server can count the number until the valid count parameter (VC) = 0 or reuse the encryption key information until the expiration of the encryption key sharing valid time, thereby performing the data transmission process.

For example, if the encryption key sharing effective time is set to 1 hour, the content server performs a transmission process for each of the 8 pieces of content requested by the client within the valid time of 1 hour, and the valid count parameter VC is sequentially . If the transmission of the requested content is not completed or the valid count indicator is 1 or more after the expiration of the set validity time, the encryption key information shared with the client is invalidated to prevent the abuse / misuse of the encryption key information have.

In FIG. 5, for convenience of explanation, the client transmits the content-based service request message including the encrypted detailed information for each of the eight songs to the content server sequentially after the completion of the service, It is not. As another example, even when the service for the requested content is not completed, the client can transmit the request message for the next sequential content based on the encryption key information to receive more than one content data at the same time.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

Claims (13)

A method for performing a multi-session based data service on a terminal client in a system including a content server performing a content providing service,
Receiving a group content service request message including a multi-session download indicator indicating whether a plurality of content data services are requested from the terminal client and a valid count parameter indicating the number of unserviced content among the requested plurality of contents;
Generating shared encryption key information to be used for a process on a plurality of content data based on the multisession download indicator; And
And performing a transmission process for each of the plurality of content data using the same shared encryption key information. The method according to claim 1,
Further comprising storing the valid count parameter included in the received group content service request message. 3. The method according to claim 1 or 2,
Transmitting the shared encryption key information to the terminal client; And
Further comprising the step of receiving a content-based service request message from the terminal client,
Wherein the service request message for each content includes detailed information for each content encrypted based on the encryption key information in the terminal client. The method of claim 3,
Wherein the step of performing the plurality of content-
Further comprising determining whether to use the shared encryption key information based on a predetermined encryption key sharing valid time and the valid count parameter. 5. The method of claim 4,
When determining to use the shared encryption key information,
Decrypting the encrypted content-based detailed information included in the received content-based service request message using the shared encryption key information; And
And transmitting the content data corresponding to the content-based service request message to the terminal client. 5. The method of claim 4,
Further comprising invalidating the encryption key information if at least one of the encryption key sharing valid time and the valid count parameter expires. A system for providing a multi-session based content data service,
And a content server for serving a plurality of content data to the terminal client of the user according to a user request,
The content server comprises:
Receiving a multi-session download indicator indicating whether a plurality of content data services are requested from the terminal client and a group content service request message including a valid count parameter indicating the number of unserviced content among a plurality of requested content,
Wherein the shared session key generation unit generates shared key key information to be used in a process on a plurality of pieces of content data based on the multisession download indicator and performs a transfer process for each of the plurality of content data using the same shared key information, Based content data service. 8. The method of claim 7,
The content server comprises:
A client interlocking unit for interfacing with the terminal client to perform signal transmission / reception with the terminal client;
A processor for generating the shared encryption key information and performing a transmission process for each of the plurality of pieces of content data; And
And a parameter storage unit for storing the valid count parameter included in the received group content service request message. 9. The method of claim 8,
The processor comprising:
Further comprising a comparison operation unit for determining whether to use the shared encryption key information based on a predetermined encryption key sharing valid time and the valid count parameter. 10. The method of claim 9,
When the comparison operation unit determines that at least one of the encryption key sharing valid time and the valid count parameter has expired,
Wherein the processor invalidates the encryption key information stored in the parameter storage unit. In a terminal client using a multi-session based communication service,
A server interworking unit for interworking with a content server providing a multi-session based communication service;
A user input unit for inputting request information for a plurality of content services according to a user request; And
And a controller for generating a group content service request message related to the plurality of content service requests input by the user input unit and transmitting the group content service request message to the content server through the server linkage unit,
Wherein the control unit includes a multisession download indicator indicating whether a plurality of content data service requests are included in the group content service request message and a valid count parameter indicating the number of unserviced content among a plurality of requested content,
Wherein the control unit encrypts detailed service request related information for each of the plurality of contents based on the same shared encryption key information and transmits the encrypted detailed information to the contents server. 12. The method of claim 11,
Further comprising a memory unit for storing shared encryption key information to be used in a process on the plurality of pieces of content data received from the content server through the server interworking unit. delete

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