KR20120136956A - Method of providing a contents service in p2p network through selection of a sender - Google Patents

Abstract

PURPOSE: A content service providing method in a P2P network through transmitter selection is provided to minimize information exposure of a receiver and a transmitter and perform an optimized encoding/decoding process, thereby increasing system performance and protecting personal information. CONSTITUTION: Content information is requested to a membership server(S100). A part of transmitters is selected among a content holder list transmitted from the membership server corresponding to a request(S102,S104). A selection result is transmitted to the membership server. An encoded ticket is received from the membership server corresponding to transmission of the selection result(S106). [Reference numerals] (S100) 1. content information request; (S102) 2. content holder list transmission; (S104) 3. transmitter selection; (S106) 4. ticket delivery; (S108) 5. ticket delivery; (S110) 6. content delivery

Description

METHOOD OF PROVIDING A CONTENTS SERVICE IN P2P NETWORK THROUGH SELECTION OF A SENDER}

The present invention relates to a method for providing a content service in a P2P network.

In peer-to-peer networks, peers can either send or receive content. That is, each peer can act as a sender and a receiver.

However, in the conventional P2P network, the intention of the user (peer) is not reflected and the user's active participation cannot be induced. Specifically, the receiver could receive content only through the sender designated by the server, and thus could not induce voluntary participation of the receiver because it was not motivated.

In addition, in the conventional P2P network, the disclosure of the information of the receiver or the sender was not considered at all, and thus, the user was passive with respect to the contents he owned or desired to receive, and information theft and financial damage could be caused.

In addition, in order to secure the P2P network, it is inconvenient to actually use the P2P network due to the unnecessary repetition of the encryption / decryption process and the design without considering the performance.

The present invention provides a method of providing a content service in a P2P network that enables a receiver to select a sender and thus expands the participation rate of the receiver.

In addition, the present invention provides a method of providing a content service in a P2P network which minimizes exposure of recipients and senders and performs an optimal encryption / decryption process to protect personal information and improve system performance.

In order to achieve the above object, a method for providing a content service in a receiver terminal of a P2P network according to an embodiment of the present invention comprises the steps of: requesting content information from a membership server; Selecting some senders from a list of content holders sent from the membership server according to the request; And transmitting the selection result to the membership server.

A method of providing a content service in a membership server of a P2P network according to an embodiment of the present invention includes transmitting a content holder list to the receiver terminal according to a request for content information of a receiver terminal; And transmitting information on the sender included in the sender selection information transmitted from the receiver terminal to the receiver terminal. Here, the sender selection information has a list of at least one sender selected by the receiver.

A method of providing a content service in a sender terminal of a P2P network according to an embodiment of the present invention includes: obtaining a symmetric key of the receiver terminal and the sender terminal encrypted with a ticket and a public key of the sender terminal from a receiver terminal; And encrypting content with the obtained symmetric key and transmitting the content to the receiver terminal. Here, the ticket has sender information, receiver information and content name.

In the P2P network according to the present invention, the content service providing method uses only the minimum information necessary for distinguishing the receiver and the sender, in particular, IP information, so that the identity exposure of the receiver and the sender can be minimized, so that the user (sender and receiver) You can protect your privacy and increase your participation in the service.

In addition, the content service providing method gives the receiver the right to select the sender, thereby improving the participation rate of the receiver and creating a new additional service.

In addition, since the content service providing method eliminates unnecessary encryption / decryption processes and configures the content service providing system based on an optimal encryption design, the performance of the system can be improved and maintenance and maintenance costs can be considerably reduced.

1 is a diagram illustrating a process and a system for providing a content service in a P2P network according to a first embodiment of the present invention.
2 is a diagram illustrating an encryption and decryption process according to an embodiment of the present invention.
3 is a diagram illustrating a process and a system for providing a content service in a P2P network according to a second embodiment of the present invention.
4 is a diagram illustrating a process of providing a content service in a P2P network according to a third embodiment of the present invention.
5 is a block diagram showing the configuration of a receiver terminal according to an embodiment of the present invention.
6 is a block diagram showing the configuration of a membership server according to an embodiment of the present invention.
7 is a block diagram showing the configuration of a sender terminal according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The method for providing a content service in a P2P network of the present invention provides a method for transmitting and receiving content between peers in a network capable of transmitting and receiving content. For example, the content service method provides transmission and reception of content on the Internet, content transmission and reception between smartphones, and the like.

In recent years, transmission and reception between smartphones and transmission and reception between smartphones and smartphones using 3G networks or Wi-Fi have been activated. The content service providing method of the present invention is suitable for transmitting and receiving content between such terminals and between a terminal and a server.

Hereinafter, a method of providing a content service of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a process and a system for providing a content service in a P2P network according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating an encryption and decryption process according to an embodiment of the present invention. .

Referring to FIG. 1, the content service providing system according to the present embodiment is a network in which a plurality of nodes (peers) participate in a content service, and includes a plurality of peers and a membership server 102.

Each of the peers can transmit or receive content so that both the recipient and the sender can be. However, for convenience of description below, it is assumed that the first peer is a receiver receiving content, and the second peer is a sender providing the corresponding content to the first peer. In addition, terminals owned by the first peer and the second peer will be referred to as a receiver terminal 100 and a sender terminal 104, respectively.

The terminal 100 or 102 is a terminal owned by a peer, and may be a laptop, a desktop, a smartphone, an IPTV, a terminal of a cloud computing system, a computer of a contents distribution network, or the like. Here, the terminals 100 and 102 may be connected to the membership server 102 by wireless or wired.

The membership server 102 collects and manages information necessary for operating a content service, for example, subscriber information (ID, password, etc.) and content information (file name, owner, etc.), and provides request information to a peer requesting a service. do. The membership server 102 also manages symmetric keys, public keys, and the like. Of course, symmetric keys, public keys, etc. used for security may be managed by other servers that exist independently of the membership server 102.

Hereinafter, a method of providing content in such a content service providing system will be described in detail.

1 and 2, the receiver terminal 100 requests the membership server 102 for information on content to be provided (S100). According to an embodiment of the present invention, the receiver terminal 100 encrypts the title of the content with a symmetric key (K _{a -s} ) between itself and the membership server 102, and requests the content information including the encrypted information. Send a signal to the membership server 102. Here, the symmetric key K _as is generated and managed when the receiver subscribes to the service.

Subsequently, the membership server 102 decrypts the content information request signal with a symmetric key K _as between the receiver terminal 100 and itself to confirm the title of the content, and to determine the content of the sender (peers) capable of transmitting the content. Encrypt a list (content holder list) with a symmetric key (K _as ), and then send the content information (K _{a -s} {List (B, C, D)}) having the content holder list to the receiver terminal 100. It transmits (S102). Meanwhile, the membership server 102 may first perform a process of authenticating the receiver before transmitting the content information, and may transmit the content information only when the receiver is authenticated.

According to an embodiment of the present invention, peers included in the content holder list may be selected based on a premium member rather than a general member, or may be selected based on the remaining battery capacity of the peers. In addition, the peers may be selected based on the distance between the receiver terminal 100 and the corresponding peers, or may be selected around peers approaching the receiver terminal 100. That is, peers of the content holder list may be selected by various criteria.

Subsequently, the receiver terminal 100 decodes the transmitted content information with a symmetric key K _as between itself and the membership server 102 to obtain a content holder list, and the receiver receives at least a portion of the content holder list. The sender is selected, and the selection result (sender selection list) is encrypted with the symmetric key Ka _{a -s} and transmitted to the membership server 102 (S104).

According to an embodiment of the present invention, the receiver may select a sender to transmit content to the user from the list of content holders in consideration of incentives. That is, the receiver may arbitrarily select a sender to transmit and provide incentives to the sender when content is downloaded.

Subsequently, the membership server 102 decodes the transmitted sender selection list using a symmetric key K _as , generates a ticket to be used between the receiver and the sender, and obtains information about the ticket, that is, ticket information. The receiver terminal 100 transmits the encrypted data using the symmetric key K _as to the receiver terminal 100 (S106). Here, the membership server 102 may generate tickets for each sender for each sender when there are a plurality of senders selected by the receiver.

According to an embodiment of the present invention, the ticket may include recipient information, sender information, content name, sender's public key and timestamp information, and is encrypted with the private key K _{S −} of the membership server 102. do. That is, the ticket is _S K _- can be represented as {A, B, FileName, K b +, TS}. Here, A and B represent a receiver and a sender, respectively, K _{b +} represents the public key of the sender, and TS (timestamp) information represents current time information to prevent an intermediate attack.

According to an embodiment of the present invention, the receiver information and the sender information may be displayed only as IP information in order to minimize identity exposure. On the other hand, the receiver is a user requesting the content to the membership server 102, the same is recorded in all tickets, but the sender is recorded by one sender selected by the receiver. That is, the membership server 102 generates and transmits as many tickets as the number of senders selected by the receiver.

Subsequently, the receiver terminal 100 checks whether the ticket included in the received ticket information is normal by using the public key of the membership server 102.

If it is determined in the normal ticket, the recipient terminal 100 generates a symmetric key (K _ab) to be used for communication with the sender terminal 104, and by using the symmetric key (K _ab) the generated and encrypted the ticket, The generated symmetric key K _ab is encrypted with the public key K _{b +} of the sender terminal 104 and then transmitted to the sender terminal 104 together with the encrypted ticket to request content transmission (S108). . That is, the recipient terminal 100 K _{s -} sends a {A, B, FileName, K b +, TS} and K _{b +} K _{{a} -b} to the sender terminal 104.

Subsequently, the sender terminal 104 decrypts the transmitted ticket and the encrypted symmetric key K _ab to obtain a symmetric key K _ab , and decrypts the encrypted ticket to symmetric the corresponding content according to the request. After encryption with the key (K _ab ) is transmitted to the receiver terminal (100) (S110).

In summary, the content service providing method of the present invention may allow a receiver to arbitrarily select a sender, and maintain security for a user (receiver and sender) and content using a symmetric key.

Let us look at the effects on the features of the present invention.

First, the participation rate of the user can be expanded. In general, users exchanging content do not want the kind of content they receive or the kind of content they have to be disclosed to the outside. In the related art, the security of the user is not guaranteed, so the user participation rate is low. However, since the present invention provides a service using only the minimum information necessary for distinguishing a user (a receiver and a sender), in particular, IP information, exposure of the user can be minimized, thereby increasing the participation rate of the user. Can be.

Second, the conventional P2P network does not give the receiver the choice of the sender to satisfy the needs of users. However, the present invention empowers the recipient to select the sender, that is, reflects the user's intention, thereby not only satisfying the needs of the users but also creating new additional services.

Third, in the conventional P2P network, the indiscriminate use and inefficient design of the encryption scheme degrades the overall performance of the system and increases the maintenance and repair costs. However, since the present invention configures the system based on the optimal encryption design, the performance of the system can be improved and the maintenance and maintenance costs can be significantly reduced.

3 is a diagram illustrating a process and a system for providing a content service in a P2P network according to a second embodiment of the present invention.

Referring to FIG. 3, the content service providing system of the present embodiment includes a receiver terminal 300, a membership server 302, and a plurality of sender terminals 304, 306, and 308.

The receiver terminal 300 may receive the divided content from the sender terminals 304, 306, and 308 for quick delivery of the content. For example, when the capacity of the content to be transmitted to the receiver terminal 300 is 600MB (Mbyte), the first sender terminal 304 transmits an initial 200MB section to the receiver terminal 300, and the second sender terminal 306 ) Transmits an intermediate 200MB interval to the receiver terminal 300, and the third sender terminal 308 may transmit the last 200MB interval to the receiver terminal 300.

Accordingly, the receiver terminal 300 receives the first content holder list owning the initial 200 MB section, the second content holder list owning the middle 200 MB section, and the third content holder list owning the last 200 MB section from the membership server 302. It is provided, it is possible to select the desired senders from the content holder list. In this case, the membership server 302 transmits the tickets corresponding to the selected senders to the receiver terminal 300.

On the other hand, in the process of transmitting and receiving between the receiver terminal 300 and the membership server 302 is used a symmetric key between them, and in the process of transmitting and receiving between the receiver terminal 302 and each of the sender terminals 304, 306 and 308 The public key of the terminal 304, 306 or 308 and the symmetric key between the receiver terminal 302 and the sender terminal 304, 306 or 308 are used.

In summary, in the content service providing method of the present embodiment, a receiver may divide content from a plurality of senders and receive the content in parallel. As a result, the transmission speed of the content can be improved.

4 is a diagram illustrating a process of providing a content service in a P2P network according to a third embodiment of the present invention. However, it is assumed that the content service providing system is the system of FIG. 1.

Referring to FIG. 4, the receiver terminal 100 requests information about content to be provided to the membership server 102 (S400). Here, the content request information is encrypted with a first symmetric key between itself and the membership server 102.

Subsequently, the membership server 102 encrypts the list (content holder list) of the senders (peers) capable of transmitting the content with the first symmetric key and transmits it to the receiver terminal 100 (S402).

Subsequently, the receiver terminal 100 selects some senders from the content holder list, encrypts the selection result (sender selection list) with the first symmetric key, and transmits the result to the membership server 102 (S404).

Subsequently, membership server 102 generates a ticket to be used between the recipient and the senders according to the sender selection list, encrypts the ticket with a first symmetric key, and encrypts information about the ticket, i.e., encrypted ticket information. The receiver 100 transmits to the receiver terminal 100 (S406).

Subsequently, the receiver terminal 100 decrypts the received encrypted ticket information by using the public key of the membership server 102 to confirm whether the ticket is normal, and if it is determined that the ticket is normal, the receiver terminal 100 and the sender terminal 104. A second symmetric key to be used for communication is generated (S408).

Subsequently, the receiver terminal 100 encrypts the ticket decrypted with the first symmetric key with the generated second symmetric key, encrypts the second symmetric key with the public key of the transmitter terminal 104, and transmits the sender terminal together with the encrypted ticket. In step S410, a request is made for content transmission.

Subsequently, the sender terminal 104 decrypts the transmitted encrypted ticket and the encrypted second symmetric key to obtain a ticket and a second symmetric key, and sends the content to a plurality of parts according to the request. After dividing, the first part is encrypted with the second symmetric key and then transmitted to the receiver terminal 100 (S412). However, after transmitting the first part, the transmitter terminal 104 does not immediately transmit the second part but waits until the incentive arrives.

Subsequently, when it is determined that the correct part has been transmitted, the receiver terminal 100 encrypts the incentive according to the first part transmission with the second symmetric key, for example, and transmits the incentive according to the second symmetric key (S414).

Subsequently, after confirming the incentive, the transmitter terminal 104 encrypts the second part with the second symmetric key and transmits the second part to the receiver terminal 100 (S416).

Subsequently, when it is determined that the correct part is transmitted, the receiver terminal 100 encrypts the incentive according to the second part transmission with, for example, the second symmetric key and transmits the incentive to the sender terminal 104 (S418).

In summary, in the content service providing method of the present embodiment, a receiver selects a sender and provides an incentive according to content transmission of the selected sender. In particular, the sender may divide the content into parts, transmit the content, and receive a corresponding incentive. Of course, the sender may be provided with an incentive after transmitting the content without dividing the content.

This method of providing incentives can also be applied to the second embodiment.

5 is a block diagram showing the configuration of a receiver terminal according to an embodiment of the present invention.

Referring to FIG. 5, the receiver terminal of the present embodiment includes a control unit 500, a transceiver 502, a content unit 504, an authentication unit 506, an encryption unit 508, a decryption unit 510, and an incentive unit ( 512 and storage 514.

The transceiver 502 is a connection path between the receiver terminal and the membership server, and between the receiver terminal and the sender terminal.

The content unit 504 includes a content information request unit 520, a content request unit 522, and a content management unit 524.

The content information requesting unit 520 requests content information from the membership server.

The content requester 522 requests content from at least one sender terminal according to the ticket information transmitted from the membership server.

The content manager 524 manages the content provided from the sender terminal and, for example, combines parts of the content transmitted from the sender terminals to generate one content.

The authenticator 506 authenticates whether the content or part transmitted from the sender terminal is the correct content or part.

The encryption unit 508 performs various encryption related functions, for example, generates a symmetric key between the receiver terminal and the sender terminal, the symmetric key between the receiver terminal and the sender terminal, and the receiver terminal and the Manage symmetric keys between membership servers.

The decoder 510 decodes the signal transmitted from the membership server and the signal transmitted from the receiver terminal using a symmetric key or the like.

The incentive unit 512 generates an incentive and provides the generated incentive to the receiver terminal.

The storage unit 514 stores various data such as content, a content holder list, and the like.

The controller 500 generally controls the operation of various components of the user terminal.

6 is a block diagram showing the configuration of a membership server according to an embodiment of the present invention.

Referring to FIG. 6, the membership server of the present embodiment includes a controller 600, a transceiver 602, an authentication unit 604, an encryption unit 606, a list manager 608, a ticket unit 610, and a storage unit ( 612).

The transceiver 602 is a communication path between the receiver terminal and the sender terminal.

The authenticator 604 authenticates the receiver terminal by using a symmetric key between the membership server and the receiver terminal.

The encryption unit 606 performs various encryption-related functions, and for example, encrypts a content holder list and a ticket using a symmetric key between the membership server and the receiver terminal.

The list manager 608 generates a list having contents according to the content request of the receiver terminal and provides the list to the receiver terminal.

The ticket unit 610 generates a ticket having information on the sender selected by the receiver and provides the ticket to the receiver terminal.

The storage unit 612 stores various data such as a content holder list, a ticket, a sender selection list, and the like.

The controller 600 controls the overall operation of the components of the membership server.

7 is a block diagram showing the configuration of a sender terminal according to an embodiment of the present invention.

Referring to FIG. 7, the sender terminal of the present embodiment includes a control unit 700, a transceiver 702, an authentication unit 704, an encryption unit 706, a content unit 708, an incentive unit 710, and a storage unit ( 712).

The transceiver 702 is a connection path between the sender terminal and the membership server, and between the sender terminal and the receiver terminal.

The authenticator 704 authenticates the receiver terminal and the like.

The encryption unit 706 encrypts a signal, content, and the like transmitted to the receiver terminal using a symmetric key between the receiver terminal and the sender terminal.

The content unit 708 manages the content requested by the receiver terminal, for example, divides the content into parts, and then transmits the parties to the receiver terminal sequentially.

The incentive unit 710 manages incentives provided from the receiver terminal.

The storage unit 712 stores various data such as content.

The control unit 700 controls the overall operation of the components of the sender terminal.

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Should be considered to be within the scope of the following claims.

100: receiver terminal 102: membership server
104: sender terminal 300: receiver terminal
302: membership server 304, 306, 308: sender terminal

Claims (10)

A method for providing a content service in a receiver terminal of a P2P network,
Requesting content information from the membership server;
Selecting some senders from a list of content holders sent from the membership server according to the request; And
And transmitting the selection result to the membership server. The method of claim 1, wherein the method of providing the content service comprises:
Receiving an encrypted ticket sent from the membership server according to the transmission of the selection result;
Generating a second symmetric key between the selected sender terminal and the receiver terminal;
Encrypting the ticket with the generated second symmetric key;
Encrypting the generated second symmetric key with a public key of the sender terminal;
Requesting content by transmitting the encrypted second symmetric key and the encrypted ticket to the sender terminal; And
Receiving the content transmitted from the sender terminal according to the request;
The content information is encrypted with a first symmetric key between the receiver terminal and the membership and transmitted to the membership server, and the content holder list is encrypted with the first symmetric key and transmitted from the membership server to the receiver terminal. The ticket is encrypted with the first symmetric key or the second symmetric key to include receiver information, sender information, content name, sender's public key and timestamp information, and the content is encrypted with the second symmetric key and is sent from the sender terminal. And providing the content service in the receiver terminal of the P2P network, which is transmitted to the receiver terminal. The method of claim 2, wherein the receiver information and the sender information is displayed as IP information, and the first symmetric key is generated when a subscriber service is subscribed to, and the receiver terminal is a laptop, a desktop, a smartphone, an IPTV, a cloud computing system (Cloud). A method of providing a content service in a receiver terminal of a P2P network, which is a terminal of a computing system or a computer of a contents distribution network. The method of claim 2, wherein the sender terminal divides the content into a plurality of parts and sequentially transmits the content to the receiver terminal, and the receiver terminal transmits an incentive to the sender terminal according to the content transmission from the sender terminal. Method for providing a content service in the receiver terminal of the P2P network, characterized in that. In the method for providing a content service in a membership server of a P2P network,
Transmitting a content holder list to the receiver terminal according to a content information request of the receiver terminal; And
And transmitting information on the sender included in the sender selection information transmitted from the receiver terminal to the receiver terminal.
And wherein the sender selection information has a list of at least one sender selected by a receiver. The apparatus of claim 5, wherein the content holder list is encrypted by a symmetric key between the receiver terminal and the membership server and transmitted to the receiver terminal, and the ticket is encrypted by the symmetric key and transmitted to the receiver terminal. Wherein the ticket includes recipient information, sender information, content name, sender's public key and timestamp information. The method of claim 5, wherein the receiver information and the sender information are represented by IP information, and the symmetric key is generated when a subscriber service is subscribed. The method of claim 5, wherein the sender to be included in the content holder list is a premium member or a general member, a battery level of the sender terminals, a distance between the receiver terminal and the sender terminals, or a degree of access to the receiver terminal. Method for providing a content service in a membership server of a P2P network, characterized in that determined by. A method for providing a content service in a sender terminal of a P2P network,
Obtaining a ticket and a symmetric key of the receiver terminal and the sender terminal encrypted with the public key of the sender terminal from the receiver terminal; And
Encrypting content with the obtained symmetric key and transmitting the encrypted content to the receiver terminal;
And wherein the ticket has sender information, receiver information, and content name. The terminal of claim 9, wherein the receiver information and the sender information are displayed as IP information, the symmetric key is generated by the receiver terminal, and the sender terminal is a laptop, desktop, smartphone, IPTV, terminal of a cloud computing system. Or a computer of a content distribution network, wherein the sender terminal of the P2P network provides a content service.

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