KR101595099B1 - Method for providing security code service - Google Patents

Method for providing security code service Download PDF

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Publication number
KR101595099B1
KR101595099B1 KR1020150055232A KR20150055232A KR101595099B1 KR 101595099 B1 KR101595099 B1 KR 101595099B1 KR 1020150055232 A KR1020150055232 A KR 1020150055232A KR 20150055232 A KR20150055232 A KR 20150055232A KR 101595099 B1 KR101595099 B1 KR 101595099B1
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KR
South Korea
Prior art keywords
user
terminal
authentication
code
security code
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KR1020150055232A
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Korean (ko)
Inventor
권오석
Original Assignee
주식회사 기가코리아
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Priority to KR1020150055232A priority Critical patent/KR101595099B1/en
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Publication of KR101595099B1 publication Critical patent/KR101595099B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3226—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a predetermined code, e.g. password, passphrase or PIN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0815—Network architectures or network communication protocols for network security for authentication of entities providing single-sign-on or federations

Abstract

A method for providing a security code service, the method comprising: transmitting and storing an encrypted user authentication code to a user terminal; storing user data of the user terminal and a user authentication code Generating a primary security code and transmitting the primary security code to the user terminal when the authentication is completed and receiving an event requesting the primary security code from the secure authentication terminal; And if it is received, re-authenticating the user terminal and transmitting the re-authentication result to the security authentication terminal.

Description

{METHOD FOR PROVIDING SECURITY CODE SERVICE}

The present invention relates to a security code service providing method.

Recently, as users of smartphones and smart pads have surged, a method of authenticating a user is also performed by transmitting an authentication code composed of text including numerals and characters using the message function of a smart phone in addition to the identification card, The method of authenticating a user according to whether or not the user is authenticated is often used.

At this time, a method of authenticating a user is performed by using an image authentication code. In this regard, Korean Unexamined Patent Publication No. 2012-0104455 (published on Sep. 22, 2012) provides a code image to a user, and when recognition data recognizing a code image is received from a smart terminal, a key mapped to recognition data And then transmits the account information linked to the key value to the smart phone so as to enable inter-personal remittance processing.

However, in the case of authentication and remittance processing by merely receiving the image code from the smart terminal, it is impossible to confirm whether or not the image code is received from the smart terminal, so there is no way to confirm whether the image user is a party user. There is a possibility that an accident will occur when a remittance process is performed, and only a online authentication occurring in a smart terminal is possible, and there is a problem that a flow of a process of accessing a user from another device or granting access can not proceed at all.

One embodiment of the present invention is to prevent the risk of hacking or unauthorized copying by using a code imaged from a text code having vulnerability of an open type security, A security code service providing method capable of minimizing the risk of a security incident by applying a security code and re-authenticating after user identification and authentication are performed with a user authentication code can be provided. It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a method of transmitting an encrypted user authentication code to a user terminal, the method comprising: Generating a primary security code and transmitting the primary security code to the user terminal upon receiving an event requesting the primary security code from the secure authentication terminal after the authentication is completed; And transmitting the re-authentication result to the secure authentication terminal by re-authenticating the user terminal when the transmitted primary security code is received from the user terminal.

According to any one of the above-mentioned objects, the use of the image authentication code minimizes the risk of duplication and hacking and the risk of leakage of the code when disclosed, It can be used not only on-line but also when users are offline, and can be utilized even more intuitively.

1 is a block diagram illustrating a security code service providing system according to an embodiment of the present invention.
2 is a block diagram illustrating the security code service providing server shown in FIG.
3 is a diagram illustrating an embodiment of a security code service executed in the security code service providing system shown in FIG.
4 is a diagram illustrating another embodiment of a security code service executed in the security code service providing system shown in FIG.
5 is a diagram illustrating a process in which data is transmitted and received between the respective components included in the security code service providing system of FIG. 1 according to an embodiment of the present invention.
6 is a flowchart illustrating a method of providing a security code service 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, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a security code service providing system according to an embodiment of the present invention. 1, the security code service providing system 1 may include a user terminal 100, a security code service providing server 300, a secure authentication terminal 400, and a user peripheral terminal 500. However, since the security code service providing system 1 of FIG. 1 is only an embodiment of the present invention, the present invention is not limited to FIG.

At this time, the respective components of FIG. 1 are generally connected through a network 200. For example, as shown in FIG. 1, a user terminal 100 and a security code service providing server 300 may be connected through a network 200. Also, the user terminal 100 may be connected to the security authentication terminal 400 through the network 200 and the security code service providing server 300. The secure code service providing server 300 can connect the user terminal 100 and the secure authentication terminal 400 through the network 200. [ The security code service providing server 300 may be connected to the user terminal 500 through the network 200. [

Here, the network 200 refers to a connection structure capable of exchanging information between nodes such as terminals and servers. An example of the network 200 is an Internet, a LAN (Local Area Network) ), Wireless LAN (Local Area Network), WAN (Wide Area Network), PAN (Personal Area Network), 3G, 4G, LTE, Wi-Fi and the like. The user terminal 100, the security code service providing server 300, the security authentication terminal 400, and the user peripheral terminal 500 illustrated in FIG. 1 are not limited to those shown in FIG.

The user terminal 100 receives the user authentication code through the security code service providing server 300 and receives the access permission of the security object connected to the security authentication terminal 400 using the received user authentication code . In addition to the user authentication code, the user terminal 100 transmits the authentication code to the security authentication terminal 400 or the user peripheral terminal 500 using the primary security code or the secondary security code received from the security code service providing server 300 The user terminal 100 may be implemented as a terminal capable of accessing a remote server or a terminal through the network 200. In this case, Also, the user terminal 100 may be implemented as a computer capable of accessing a remote server or terminal through the network 200. Here, the computer may include, for example, a notebook, a desktop, a laptop, and the like. Also, the user terminal 100 may be implemented as a terminal capable of connecting to a remote server or terminal through the network 200. [ For example, the user terminal 100 may be a wireless communication device that is guaranteed to be portable and mobility, such as a Personal Communication System (PCS), a Global System for Mobile communications (GSM), a Personal Digital Cellular (PDC) System, a PDA (Personal Digital Assistant), an IMT (International Mobile Telecommunication) -2000, a Code Division Multiple Access (CDMA) -2000, a W-CDMA (W-CDMA) A handheld based wireless communication device such as a smartphone, a smartpad, a tablet PC, and the like.

The secure code service providing server 300 may be a server that receives user data from the user terminal 100 and authenticates the user and transmits a user authentication code for user authentication. The security code service providing server 300 generates and transmits the primary security code to the user terminal 100 when the event for scanning the user authentication code occurs from the security authentication terminal 400, The security authentication terminal 400 may transmit the authentication result to the security authentication terminal 400 when the primary security code is received. In this case, the user authenticates the user at the secure authentication terminal 400 using the stored user authentication code, the secure authentication terminal 400 transmits the scan result to the secure code service providing server 300 to authenticate the user, When the security code service providing server 300 matches the primary security code transmitted from the user terminal 100 with the primary security code transmitted thereto, the security code service providing server 300 transmits the user access approval to the security authentication terminal 400, Code and security code alone can provide strong security settings, and by using encrypted and coded image authentication codes rather than public keys, it is possible to provide an intuitive security method that can not be duplicated or tampered with. At this time, the security code service providing server 300 may be implemented as a terminal that can access a remote server or a terminal through the network 200. [ The security code service providing server 300 may be implemented as a computer capable of accessing a remote server or terminal through the network 200. [ Here, the computer may include, for example, a notebook, a desktop, a laptop, and the like.

The security authentication terminal 400 may be a terminal that scans the user authentication code of the user terminal 100 and transmits the scanned user authentication code to the security code service providing server 300. When the authentication result of the user terminal 100 is received from the secure code service providing server 300, the secure authentication terminal 400 proceeds to the process of allowing the user to access the authentication object of the secure authentication terminal 400 Or the like. At this time, the security authentication terminal 400 may be a terminal capable of scanning, photographing or displaying a user authentication code, and may be a terminal including a device such as a camera and a scanner.

The user peripheral terminal 500 may be a terminal used by a user. At this time, the user terminal 500 may be a terminal that scans the secondary security code of the user terminal 100, transmits the secondary security code to the security code service providing server 300, and receives the result. Alternatively, the user terminal 100 receives the secondary security code from the security code service providing server 300 and receives the authentication result between the user terminal 100 and the security code service providing server 300 that have scanned the secondary security code Terminal. Accordingly, the user peripheral terminal 500 may be a terminal that proceeds the process of allowing the user to access the user peripheral terminal 500 according to the authentication result. At this time, the user peripheral terminal 500 may be a terminal that scans, photographs or displays a user authentication code or a secondary security code, and may be a terminal including a camera, a scanner, and the like. At this time, the user peripheral terminal 500 may be implemented as a terminal capable of connecting to a remote server or terminal through the network 200. The user peripheral terminal 500 may be implemented as a computer capable of connecting to a remote server or terminal through the network 200. [ Here, the computer may include, for example, a notebook, a desktop, a laptop, and the like.

FIG. 2 is a block diagram illustrating the security code service providing server shown in FIG. 1, FIG. 3 is a diagram illustrating an embodiment of a security code service executed in the security code service providing system shown in FIG. 1, 4 is a diagram illustrating another embodiment of a security code service executed in the security code service providing system shown in FIG.

2, a security code service providing server 300 according to an embodiment of the present invention includes a storage unit 310, a primary authentication unit 320, a first transmission unit 330, a second A transmission unit 340, a database unit 350, and a secondary authentication unit 360.

A security code service providing server 300 according to an embodiment of the present invention or another server (not shown) operating in conjunction with the security code service providing server 300 may transmit a security code service application, a program, 200 to the user terminal 100, the user terminal 100 can install or open an application, a program, a web page, and the like for the service. Also, it may be driven in the user terminal 100 by using a script executed in the web browser. Here, a web browser is a program that enables a WWW (World Wide Web) service, and is a program for receiving and displaying hypertext described in hypertext mark-up language (HTML), for example, Netscape (Netscape) An Explorer, chrome, and the like. Further, the application refers to an application on the terminal, for example, an app (app) running on a mobile terminal (smart phone). An app can be downloaded and installed from the mobile app marketplace, a virtual marketplace where mobile content can be bought and sold freely.

At this time, the user terminal 100, the security code service providing server 300, the security authentication terminal 400, and the user peripheral terminal 500 may be connected to each other to be able to communicate with each other through the network 200, Generating the connection means that the security code service providing server 300 creates a communication object at the communication contact for communication with the terminal connected to the network 200. The security code service providing server 300 can exchange data with each other through a communication object.

The storage unit 310 may transmit the encrypted user authentication code to the user terminal 100 and store the encrypted user authentication code. To this end, the user terminal 100 may transmit the user data to the security code service providing server 300 and receive authentication. Then, the storage unit 310 may transmit an encrypted user authentication code for identifying the user to the authenticated user terminal 100. [ Here, the user authentication code may be an imaged code, and may be code that is set to disable screen capturing, copying, editing, or the like.

The primary authentication unit 320 can authenticate the user data and the user authentication code of the user terminal 100 when an event occurs that scans the user authentication code from the secure authentication terminal 400. [ That is, when the user tries to access the security authentication terminal 400 with the security object 400 with the user terminal 100, the security authentication terminal 400 scans the user authentication code of the user terminal 100, May be identified. At this time, when the security authentication terminal 400 scans the user authentication code of the user terminal 100, the security authentication terminal 400 may scan information of the user terminal 100 as well. For example, the MAC address of the user terminal 100 may be scanned together to check whether the user authentication code is extracted from the legitimate user terminal 100. Accordingly, the primary authentication unit 320 can authenticate the user using the user data of the user terminal 100 and the user authentication code.

Upon receiving the event requesting the primary security code from the secure authentication terminal 400 after the authentication is completed, the first transmitter 330 may generate the primary security code and transmit the primary security code to the user terminal 100. For example, one of the methods of authenticating a user is to transmit a text composed of numbers or characters to the user terminal 100 and input the same into the user terminal 100. This is a method in which a number is stored, Is a public key, the possibility of replication increases when hacked. Therefore, the method of providing a security code service according to an embodiment of the present invention provides a method that can be converted into a code that can not be used immediately after hacking, even if the primary security code is imaged and encrypted to perform hacking in the middle.

When the transmitted primary security code is received from the user terminal 100, the second transmitter 340 can transmit the re-authentication result to the secure authentication terminal 400 by re-authenticating the user terminal 100. [ At this time, the user authentication code or the primary security code may be a bar code, a QR code, an ID code, a three-dimensional code, or an image code.

The database unit 350 receives and stores the user data from the user terminal 100 before transmitting the encrypted user authentication code to the user terminal 100 and stores the user data in the user terminal 100, The authentication code can be generated and converted into a database. At this time, the secure authentication terminal may include a SSO (Single Sign On) based terminal.

When the transmitted primary security code is received from the user terminal 100, the secondary authentication unit 360 re-authenticates the user terminal 100, transmits the re-authentication result to the secure authentication terminal 400, When the re-authentication result indicates that the user is a party user, the security authentication terminal 400 may transmit the secondary security code to the user's peripheral terminal 500. At this time, when receiving the event that the secondary security code is scanned from the user terminal 100 that scanned the secondary security code, the secondary security code and the user authentication code included in the received event are analyzed, When the security code and the user authentication code are authenticated, the authentication permission event may be transmitted to the user peripheral terminal 500. At this time, the user peripheral terminal 500 receiving the authentication permission event monitors the text input to the user's peripheral terminal 500 and the output text after the authentication permission event is received, and transmits the text to the security code service providing server 300 And the secure code service providing server 300 may map the monitoring result to the user terminal 100, Accordingly, the security code service providing server 300 permits access by the user using the primary security code, and permits access to the user's peripheral terminal 500 using the secondary security code. Thus, it is possible to perform double security. When approving the access, it is impossible to copy and hack by using an encrypted image code instead of a simple code, and the convenience of the user can be increased.

Meanwhile, the security code service providing server 300 transmits and stores the encrypted user authentication code to the user terminal 100, controls the security authentication terminal 400 to display the primary security code, When the scan event of the user terminal 100 that scans the security code is received, a secondary security code for authentication of the user terminal 100 is generated, the generated secondary security code is transmitted to the user terminal 100, When an event for transmitting the secondary security code is received from the user terminal 100, it is checked whether or not the generated secondary security code is identical to the transmitted secondary security code, It is possible to reconfirm whether or not the user authentication code of the user terminal 100 coincides with the pre-stored user authentication code. Then, the security code service providing server 300 may transmit an event for approving the user authentication to the security authentication terminal 400 when the user authentication code and the pre-stored user authentication code match as a result of re-verification. That is, as another embodiment different from the above-described method, the security authentication terminal 400 may not scan the primary security authentication code from the user terminal 100, but may scan the security terminal 400 from the user terminal 100 It is also possible to do this.

In this case, the security authentication terminal 400 having received the approval event authenticates the user of the user terminal 100, releases the security of the security authentication terminal 400, and transmits the unsecured event to the user terminal 100 100 to the security code service providing server 300. At this time, the user authentication code, the primary security code, and the secondary security code may be a bar code, a QR code, an ID code, a three-dimensional code, or an image code.

An embodiment of the security code service providing method of the security code service providing server 300 having the above-described configuration will be described with reference to FIGS. 3 and 4. FIG.

3 and 4, (a) the user terminal 100 may scan the authentication code of the secure authentication terminal 400 when the user intends to pass through the door. At this time, (b) the user terminal 100 analyzes the encrypted authentication code and verifies whether the code is given to the user from the system. At this time, if (c) the verified user or code, the user terminal 100 requests an authentication code for authentication to the security code service providing server 300, and (d) if it is the verified user or code, The providing server 300 confirms whether or not the information is verified through the authentication request. At this time, if the security code service providing server 300 determines that the request is a legitimate request, the security code service providing server 300 converts the authentication code, which is a security method stronger than text, into an image (d) and transmits the image to the user terminal 100. At this time, the user terminal 100 having received the imaged authentication code can receive the access permission of the door by (e) inputting the imaged authentication code and finally authenticating whether or not the user is a party user. In addition, the user terminal 100 may go through the above process again to use the user terminal 500.

The security code service providing method of FIGS. 2 to 4 will not be described. It can be easily deduced from the same or a description of the security code service providing method described above with reference to FIG. 1, Omit it.

5 is a diagram illustrating a process in which data is transmitted and received between the respective components included in the security code service providing system of FIG. 1 according to an embodiment of the present invention. Hereinafter, an example of a process of transmitting and receiving a signal according to an embodiment of the present invention will be described with reference to FIG. 5. However, the present invention is not limited to such an embodiment, and according to various embodiments described above, It is apparent to those skilled in the art that the process of transmitting and receiving the shown data can be changed.

5, when receiving a request for a user authentication code from the user terminal 100 (S5100), the secure code service providing server 300 performs user authentication and generates a user authentication code for the user terminal 100 (S5200).

At this time, the security code service providing server 300 transmits the user authentication code generated in the user terminal 100 (S5300), and the security authentication terminal 400 scans the user authentication code of the user terminal 100 (S5310 , And transmits the scan result to the secure code service providing server 300 (S5330).

Then, the security code service providing server 300 identifies the user by using the user data and the user authentication code (S5400), and when the identification is completed (S5500), the security authentication terminal 400 requests the primary security code (S5510), a primary security code is generated (S5530) and transmitted to the user terminal 100 (S5600).

If the primary security code is received from the user terminal 100, the secure code service providing server 300 checks whether the transmitted primary security code matches the generated primary security code (S5700) (S5800) the result of the re-authentication of the user terminal 100 (S5800) to the security authentication terminal 400 and the user's peripheral terminal 500, if confirmed.

Then, the security authentication terminal 400 controls the security release with the object of the security authentication terminal 400 (S5910). The user peripheral terminal 500 expects the user to approach and release the security, Preparation, that is, activating operation is started (S5920).

Accordingly, the user terminal 100 displays the secondary security code (S500). When the secondary security code is scanned in the user terminal 100 (S5940), the user terminal 100 transmits the scan result to the security code service The security code service providing server 300 confirms whether or not the user is a party user in step S5960 and instructs the user peripheral terminal 500 to release the security in step S5970. (S5980).

Here, the order between the above-described steps S5100 to S5980 is merely an example, but the present invention is not limited thereto. That is, the order between the above-described steps (S5100 to S5980) may be mutually varied, and some of the steps may be executed or deleted at the same time.

6 is a flowchart illustrating a method of providing a security code service according to an embodiment of the present invention. Referring to FIG. 6, the secure code service providing server transmits an encrypted user authentication code to the user terminal and stores the encrypted user authentication code (S6100).

Then, when an event for scanning the user authentication code is generated from the security authentication terminal, the security code service providing server authenticates the user data of the user terminal and the user authentication code (S6200).

When the security code service providing server receives the event requesting the primary security code from the security authentication terminal after the authentication is completed, the security code service providing server generates and transmits the primary security code to the user terminal (S6300).

When the transmitted primary security code is received from the user terminal, the secure code service providing server transmits the re-authentication result to the secure authentication terminal by re-authenticating the user terminal (S6400).

The security code service providing method of FIG. 6, which is not described above, can be easily deduced from the same or described contents of the security code service providing method described above with reference to FIGS. 1 to 5, .

The secure code service providing method according to the embodiment described with reference to FIG. 6 can also be implemented in the form of a recording medium including instructions executable by a computer, such as an application program module executed by a computer or a program module. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium can include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

The security code service providing method according to an embodiment of the present invention may be executed by an application installed in a terminal (which may include a program included in a platform or an operating system basically installed in the terminal) (I.e., a program) directly installed on a master terminal by a user via an application providing server such as an application store server, an application, or a web server associated with the service. In this regard, the security code service providing method according to an embodiment of the present invention may be implemented as an application (i.e., a program) installed in a terminal or directly installed by a user, Can be recorded on the medium.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (10)

Receiving and storing user data from a user terminal and transmitting the encrypted user authentication code to the user terminal by generating an encrypted user authentication code using the stored user data;
Authenticating the user data and the user authentication code of the user terminal when an event occurs to scan the user authentication code from the secure authentication terminal;
Generating the primary security code from the secure authentication terminal after the authentication is completed, and transmitting the generated primary security code to the user terminal; And
Transmitting the re-authentication result to the secure authentication terminal by re-authenticating the user terminal when the transmitted first security code is received from the user terminal; A security code service providing method in a security code service providing server,
The method of claim 1, further comprising: when the transmitted primary security code is received from the user terminal, re-authenticating the user terminal and transmitting the re-authentication result to the secure authentication terminal, Transmitting a secondary security code to a terminal of a user when the authentication is authenticated as a party user;
Analyzing the secondary security code and the user authentication code included in the received event when receiving the event that scanned the secondary security code from the user terminal that scanned the secondary security code;
Transmitting an authentication permission event to the user terminal when the second security code and the user authentication code are authenticated; Further comprising the steps of:
delete delete delete delete The method according to claim 1,
The user peripheral terminal that has received the authentication permission event monitors text and output text input to the user peripheral terminal after receiving the authentication permission event and transmits the monitored text to the security code service providing server,
Wherein the security code service providing server maps the monitoring result into a database by mapping with the user terminal. delete delete delete delete
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KR20130093793A (en) * 2011-12-31 2013-08-23 주식회사 넥스다임 Recording medium, method and system for log-in confirmation use of image code
KR101383761B1 (en) * 2011-12-22 2014-04-18 주식회사 스마트시스템즈 User authentication system and method thereof

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KR101051407B1 (en) * 2011-02-08 2011-07-22 홍승의 The system, method and recording medium for interactive security authentication on communication network
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