JPH10190876A - Callback device with illegal access protection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve security in the case of illegal access at callback. SOLUTION: In the case that a callback device 13 makes a callback to connect a remote terminal equipment 11 to a terminal equipment 14 at a center side, the callback device 13 allows the remote terminal equipment 11 for a password to be entered and a telephone number and retrieves the password. In the case that the password is illegal, the telephone number is stored as a telephone number of illegal access, so as to prohibit a callback to the telephone number which made the illegal access.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for protecting unauthorized access in a data communication system, and more particularly, to a callback apparatus suitable for use in a system for protecting unauthorized access in a callback system using a public line.

[0002]

2. Description of the Related Art Conventionally, as a method for protecting an unauthorized access of a callback system in a data communication system using a public line, as described in JP-A-62-53061, a remote terminal is disclosed. By inputting a password from the device, it is possible to make a callback to the telephone number stored in the callback device in advance, or to send a password indicating that the terminal device is an unspecified telephone number and a password from the remote terminal device. By sending the phone number of the terminal device to the center callback device,
A technique has been proposed in which a callback can be made to a designated telephone number without registering the telephone number in a callback device in advance.

[0003]

However, the conventional method described above has the following problems.

If the telephone number is registered in the callback device in advance and the registered telephone number is incorrect, the terminal device on the remote side can connect to the terminal device on the center side. Impossible.

Next, when a password indicating that the terminal device is unspecified and the telephone number of the terminal device are transmitted from the remote terminal device to the center callback device, the password is recognized. If you do not, you will not be able to connect to the terminal device at the center side, but if you change the password many times and try access to make unauthorized access, you can connect to the terminal device at the center side There is a problem of getting it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in order to solve the problems inherent in the above-described conventional technology. If you try to connect by changing the password only a number of times in order to do so, by counting the unauthorized access for each phone number, if there is an unauthorized access exceeding a certain number of times, the phone It is an object of the present invention to provide a new callback device that can improve security at the time of unauthorized access by prohibiting a callback to a number.

[0007]

In order to achieve the above object, a callback device with an unauthorized access protection method according to the present invention uses a public line from a remote terminal device via a switching device to a center terminal. A means for storing a telephone number input from a remote terminal device in a callback device for controlling connection to a terminal device, and an input when a password input from the remote terminal device is incorrect And a means for storing the number of times of unauthorized access at the specified telephone number, and a means for prohibiting the callback processing based on the number of times of unauthorized access.

[0008] In addition to the above configuration, the callback device with the unauthorized access protection method according to the present invention further comprises a password storage means for storing a password, a line connection means connected to the switching device, and a connection to the line connection means. Comparing the password transmitted from the remote-side terminal device with the password stored in the password storage means, and when the result of the comparison processing does not match, the telephone number corresponding to the transmitted password to the telephone number storage means. And callback processing means for storing

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system configuration diagram of a data communication system applied to the present invention for connecting a remote terminal device and a center terminal device using a public line.

FIG. 2 is a block diagram showing one embodiment of a callback apparatus for preventing unauthorized access at the time of callback according to the present invention. The system of the callback system in FIG. 1 includes a terminal device 11 on the remote side, a terminal device 14 on the center side, a public line switching device 12 for connecting the terminal device 14 and a callback device 13 for preventing unauthorized access in the present invention. It is configured.

The call-back apparatus according to the present invention shown in FIG. 2 includes a line connection unit 21 for performing processing for connecting a line on the remote side and a line on the center side, and a call-back function for executing a callback function. A back processing unit 22, a password storage unit 23 storing a password for permitting access to the callback, a telephone number storage unit 24 storing a designated telephone number for making a call again at the time of the callback, a callback processing unit A switch circuit 25 switches connection and disconnection of the line between the remote terminal device 11 and the center terminal device 14 by the processing in 22.

When a user makes a call from the remote terminal device 11 to connect to the center terminal device 14 from the remote terminal device 11, the user is connected to the callback device 13 via the switching device 12. In the callback device 13, a signal is transmitted to the line connection unit 21. When receiving the signal transmitted from the switching device 12, the line connection unit 21 connects the line from the remote terminal device 11 to the callback device 13, and prompts the user to input a password. Then, a response signal is transmitted to 11.

After confirming that the terminal device 11 on the remote side has received the response signal transmitted via the exchange device 12, the user inputs a password and a telephone number. The input password and telephone number are converted into signals, and are converted into a signal.
Sent to. Upon receiving the password and the telephone number, the callback processing unit 22 notifies the line connection unit 21 to disconnect the line, and the line connection unit 21 disconnects the line with the terminal device 11 on the remote side once. . The callback processing unit 22 compares the received password with the password stored in the password storage unit 23, and if the received password is a password for calling back the designated telephone number, the Line connection unit 21 so as to connect the line to the input designated telephone number
, And the line connection unit 21 connects the line to the designated telephone number via the switching device 12.

However, the callback processing unit 22
If the received password is a password that does not exist in the password storage unit 23, it recognizes that unauthorized access has occurred, stores the received telephone number in the telephone number storage unit 24, and Set 1. If the telephone number has already been stored in the telephone number storage unit 24, the number of unauthorized accesses to the telephone number is increased by one.

When the unauthorized access exceeds three times, the callback is not performed even when a normal password is input thereafter. By using this method, various passwords are input from the remote terminal device 11 to try unauthorized access, and even if an attempt is made to make a callback, the wrong password can be tried only three times. The prevention of unauthorized access can be considerably improved.

Further, in order to prevent the number of times of unauthorized access from being increased when the user enters an incorrect password due to a malfunction, the connection cannot be made again. When the callback is performed by inputting the number, the count of the number of times of unauthorized access is cleared. Therefore, the callback will not be prohibited unless the wrong password is input three times in succession.

FIG. 3 shows an operation flow of the embodiment of the present invention.

[0019]

As described above, according to the present invention,
Even if a malicious user uses various passwords to cause the center to make a callback, and attempts to retrieve the password, the number of times the password can be controlled can significantly improve security in unauthorized access.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a data communication system to which the present invention is applied to connect a remote terminal device and a center terminal device using a public line.

FIG. 2 is a block diagram showing one embodiment of a callback device according to the present invention for preventing unauthorized access at the time of callback.

FIG. 3 is a flowchart showing an operation flow of an embodiment according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 remote terminal device 12 exchange device 13 callback device 14 center terminal device 21 line connection unit 22 callback processing unit 23 password storage unit 24 telephone number storage unit 25 switch circuit

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04M 3/42 H04L 9/00 673A

Claims (3)

[Claims] 1. A callback device for controlling a remote terminal device to connect to a center terminal device via a switching device using a public line, wherein a telephone number input from the remote terminal device is provided. Means for storing the number of times of unauthorized access at the input telephone number when the password input from the remote terminal device is incorrect, and performing callback processing based on the number of times of unauthorized access. A callback device with an unauthorized access protection method, comprising a prohibiting means. 2. A password storage unit for storing a password, a line connection unit connected to the switching unit, a password connected to the line connection unit and transmitted from the remote terminal device, and stored in the password storage unit. Further comprising callback processing means for comparing the received password with the received password and storing the telephone number corresponding to the transmitted password in the telephone number storage means when the result of the comparison processing does not match. 2. The callback device with an unauthorized access protection method according to 1. 3. The callback apparatus with an unauthorized access protection method according to claim 1, wherein the number of times of unauthorized access is three.