JP3754382B2 - Double transmission check system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dual transmission check system for checking dual transmission, and more particularly to a dual transmission check system used in an electronic application system.
[0002]
[Prior art]
In recent years, electronic application systems have been developed that apply electronically to government agencies and private companies. In such an electronic application system, an application form may be duplicated due to an operation error at the time of application, and it is necessary to eliminate such double transmission.
[0003]
Conventionally, as a method of checking double transmission, first, a program is installed on the terminal side, the transmission flag is checked before transmission, transmission is performed if the transmission flag is off, and transmission is turned on after transmission. There is a way to make it. This method is a method of preventing double transmission by turning on a transmission flag.
[0004]
As a second method, there is a method of managing and checking transmitted information in a server that receives an application. In such a method, when the server can accept from an unspecified number of people, the server side processing is multiplexed, so double transmission is accepted. To check whether double transmission is being performed.
[0005]
[Problems to be solved by the invention]
However, the first method has a problem in that double transmission becomes possible by forcibly resetting the transmission flag on the terminal side.
[0006]
Further, in the second method, since the double transmission check is once performed on the received data, there is a problem that the processing takes time and the load on the system increases.
[0007]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a double transmission check system capable of checking double transmission at the time of reception of a server without increasing the system load on the server side. And
[0008]
[Means for Solving the Problems]
Therefore, in order to achieve the above object, the first invention of the present invention includes a receiving means for receiving a value determined by a one-way function of data to be transmitted and information indicating a session start time from a client computer, and A database for storing information indicating a value determined by a one-way function of received data and a session start time, and a value determined by a one-way function received by the receiving unit by a one-way function stored in the database Information indicating the session start time received by the receiving means is stored in the database when it is determined by the first determining means and the first determining means to determine whether or not it matches a fixed value. To determine whether it matches the information indicating the session start time that has been A second determination means for determining that a double sent when, if it is determined that the duplex transmission by said second determination means, a notification to the client computer that the dual transmission A server computer in the double transmission check system.
[0009]
According to a second aspect of the present invention, there is provided a transmission means for transmitting information indicating a value determined by a one-way function of data to be transmitted and a session start time to a server computer, and a transmission object transmitted by the transmission means. Receiving means for receiving from the server computer a result of double transmission determined based on a value determined by a one-way function of the data and information indicating a session start time; and a double transmission received by the receiving means Determining means for determining whether the result is double transmission; and means for transmitting the data to be transmitted to the server computer when the determination means determines that the transmission is not double transmission. A client computer in a double transmission check system.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a dual transmission check system according to an embodiment of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a diagram showing a dual transmission check system in an electronic application system according to an embodiment of the present invention.
[0012]
In the present embodiment, a method of transmitting an electronic application form from a client computer 1 to a server computer 2 connected via a network and checking the double transmission in the server computer 2 will be described.
[0013]
As shown in the figure, the client computer 1 includes a storage device 11, a hash value calculation unit 12, a session start time acquisition unit 13, a data transmission unit 14, a double transmission determination reception unit 15, and a data transmission unit 16.
[0014]
The storage device 11 stores application form data to be transmitted.
[0015]
The hash value calculator 12 calculates a hash value from the application form data to be transmitted stored in the storage device 11. Here, the hash value is a fixed-length character string obtained by converting the character string of the application form data to be transmitted using a hash function that is a one-way function, which is like a fingerprint of an electronic document. It is a thing.
[0016]
For example, a person of a book cannot be reproduced from a fingerprint, but a person can be specified. Similarly, the original document cannot be estimated and restored from the hash value, but it reflects the characteristics of the document, so that it is possible to identify the electronic document that is the source of the hash value.
[0017]
The session start time acquisition unit 13 acquires the start time of a session established when communication with the server computer is performed.
[0018]
The data transmission unit 14 transmits to the server computer 2 the hash value of the application form data to be transmitted calculated by the hash value calculation unit 12 and the session start time acquired by the session start time acquisition unit 13.
[0019]
The double transmission determination receiving unit 15 receives the result of the double transmission determination from the server, and when it is determined that the determination result of the double transmission is not double transmission, the double transmission determination receiving unit 15 transmits the data to the data transmission unit 16 Instructs the transmission of data.
[0020]
The data transmission unit 16 transmits the application form data to be transmitted to the server computer 2 based on the instruction from the double transmission determination reception unit 15.
[0021]
The server computer 2 includes a data receiving unit 21, a data identifying unit 22, an application database 23, a procedure identifying unit 24, a data receiving unit 25, and a database 26.
[0022]
The data reception unit 21 receives the hash value and the session start time of the application form data to be transmitted transmitted from the data transmission unit 14.
[0023]
As shown in FIG. 2, the application database 23 stores a hash value already received and a session start time corresponding to the hash value.
[0024]
The data identification unit 22 determines whether the hash value of the application form data to be transmitted received by the data receiving unit 21 matches the hash value of the already received application form data stored in the application database 23. Determine whether. If it is determined that they do not match, the double transmission determination reception unit 15 of the client computer 1 is notified that it is not double transmission.
[0025]
The procedure identifying unit 24 determines whether or not the session start time received by the data receiving unit 21 matches the session start time stored in the application database 23 when it is determined by the data identifying unit 22 to match. . When the procedure identification unit 24 determines that they match, it notifies the double transmission determination reception unit 15 that it is duplex transmission, and when it determines that they do not match, it notifies that it is not duplex transmission. To do. The reason for including the session start time is that the same application may be submitted at a later date for reasons such as changes.
[0026]
FIG. 3 is a diagram for explaining the start of a session.
[0027]
As shown in the figure, data communication is performed after a session is established. In the present embodiment, when data of the same application form is issued in communication at the same session start time, it is determined that duplex transmission is performed.
[0028]
Here, the “session start time” represents a time when a communication path is established to transmit data to the server. Normally, this is the start time when connected to the WEB site, and the same session start time for a series of consecutive accesses.
[0029]
The data receiving unit 25 receives the data of the application form to be transmitted transmitted from the data transmitting unit 16 of the client computer 1 and stores it in the database 26.
[0030]
Next, the operation of the dual transmission check system according to the embodiment of the present invention will be described with reference to the flowcharts of FIGS.
[0031]
First, the hash value calculation unit 12 calculates the hash value of the application form data to be transmitted (S1). Next, the session start time acquisition unit 13 acquires the session start time (S2).
[0032]
Thereafter, the hash value and the session start time are transmitted to the client computer 2 by the data transmission unit 14 (S3). In the server computer 21, the data receiving unit 21 receives the hash value and the session start time (S 4).
[0033]
Next, the data identification unit 22 determines whether or not the hash value received by the data reception unit 21 matches the hash value stored in the application database 23 (S5).
[0034]
If it is determined that they do not match, the corresponding hash value and session start time are stored in the application database 23, and the double transmission determination reception 15 of the client computer 1 is notified that it is not double transmission ( S6).
[0035]
On the other hand, if it is determined that they match, it is next determined whether or not the received session start time matches the session start time stored in the application database 23 (S7). ).
[0036]
If it is determined in S7 that they do not match, the corresponding hash value and session start time are stored in the application database 23, and the double transmission determination reception 15 of the client computer 1 indicates that the transmission is not double transmission. Notification is made (S6).
[0037]
On the other hand, if it is determined in S7 that they match, the client is notified of double transmission (S8).
[0038]
In the double transmission determination receiving unit 15 of the client computer, based on the notification from the server computer 2, it is determined whether or not it is double transmission. If it is double transmission, data is not transmitted. If it is determined that the transmission is not double transmission, the application form data to be transmitted is transmitted to the server (S10).
[0039]
The application form data transmitted from the client computer is received by the data receiving unit 25 of the server computer 2 and stored in the database 26.
[0040]
Therefore, according to the double transmission check system of the present embodiment, double transmission is checked when data is received, so double transmission can be prevented without increasing the system load on the server side.
[0041]
Further, the double transmission check system according to the embodiment of the present invention also prevents an overflow of a file on the WEB server, etc., against an access attack to the WEB server.
[0042]
Furthermore, since double transmission is checked before data is received, useless data transmission can be eliminated, and processing after reception is simplified. As a result, system construction is facilitated.
[0043]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a double transmission check system capable of checking double transmission at the time of server reception without increasing the system load on the server side.
[Brief description of the drawings]
FIG. 1 is a diagram showing a double transmission check system in an electronic application system according to an embodiment of the present invention.
FIG. 2 is a diagram showing data stored in an application database.
FIG. 3 is a diagram for explaining the start of a session.
FIG. 4 is a flowchart for explaining the operation of the dual transmission check system.
FIG. 5 is a flowchart for explaining the operation of the double transmission check system;
[Explanation of symbols]
1 ... Client computer,
2 ... Server computer,
11 ... Storage device,
12 ... Hash value calculation unit,
13 ... Session start time acquisition unit,
14: Data transmission unit,
15 ... Dual transmission determination reception unit,
16: Data transmission unit,
21 ... Data receiver,
22 ... Data identification part,
23 ... Application database,
24. Procedure identification part,
25 ... Data receiver,
26 ... Database.

Claims (9)

Receiving means for receiving from a client computer information indicating a value determined by a one-way function of data to be transmitted and a session start time;
A database for storing information indicating a value determined by a one-way function of already received data and a session start time;
First determination means for determining whether or not a value determined by the one-way function received by the receiving means matches a value determined by the one-way function stored in the database;
If it is determined by the first determining means that the information matches, the information indicating the session start time received by the receiving means is determined to match the information indicating the session start time stored in the database; A second determination means for determining that the transmission is a double transmission when the matching is determined ;
A dual transmission comprising: notifying means for notifying the client computer of a double transmission when the second determination means determines that the transmission is a double transmission; Server computer in the check system. The server computer according to claim 1, wherein the one-way function is a hash function. 2. The server computer according to claim 1, wherein the data to be transmitted is data relating to an electronic application form. Transmission means for transmitting information indicating a value determined by a one-way function of data to be transmitted and a session start time to a server computer;
  Receiving means for receiving from the server computer a result of double transmission determined based on a value determined by a one-way function of data to be transmitted transmitted by the transmitting means and information indicating a session start time;
  Determining means for determining whether the result of the double transmission received by the receiving means is a double transmission;
  Means for transmitting the data to be transmitted to the server computer when the determination means determines that the transmission is not double transmission;
A client computer in a double transmission check system, comprising: The client computer according to claim 4, wherein the one-way function is a hash function. 5. The client computer according to claim 4, wherein the data to be transmitted is data relating to an electronic application form. In a double transmission check system for checking double transmission of data transmitted from a client computer to a server computer,
  The client computer is
  Comprising a transmission means for transmitting information indicating a value determined by a one-way function of data to be transmitted and information indicating a session start time to the server;
  The server computer
  Receiving means for receiving information indicating a value determined by a one-way function of the data to be transmitted and a session start time from a client computer;
  A database for storing information indicating a value determined by a one-way function of already received data and a session start time;
  First determination means for determining whether or not a value determined by the one-way function received by the receiving means matches a value determined by the one-way function stored in the database;
  If it is determined by the first determining means that the information matches, the information indicating the session start time received by the receiving means is determined to match the information indicating the session start time stored in the database; If it matches, it is determined that it is a double transmission. A second determination means to:
  Notification means for notifying the client computer of a determination result based on the determination by the second determination means;
Comprising
  The client computer further includes:
  Receiving means for receiving the determination result notified by the notifying means;
  Determining means for determining whether or not the determination result received by the receiving means is double transmission;
  Means for transmitting the data to be transmitted to the server computer when the determination means determines that the transmission is not double transmission;
A double transmission check system comprising: Receiving from the client computer information indicating the value determined by the one-way function of the data to be transmitted and the session start time;
  The value determined by the received one-way function matches the value determined by the one-way function already received and the value determined by the one-way function stored in the database that stores information indicating the session start time. Whether or not
  When it is determined that they match, it is determined whether or not the received information indicating the session start time matches information indicating the session start time stored in the database. It is determined that
  A double transmission check method for a server computer in a double transmission check system, wherein, when it is determined that the transmission is a double transmission, the client computer is notified of the double transmission. Sends a value determined by the one-way function of the data to be transmitted and information indicating the session start time to the server computer,
  Receiving a double transmission result determined from a value determined by a one-way function of the transmitted data to be transmitted and information indicating a session start time from the server computer;
  It is determined whether the received double transmission result is a double transmission, and when it is determined that the transmission is not a double transmission, the data to be transmitted is transmitted to the server computer. A double transmission check method for a client computer in a double transmission check system.

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