JPS6359250A - Irregular access preventing system - Google Patents

Abstract

PURPOSE:To permit data communication between a remote station and a center to be restarted, when a lock releasing password is inputted from a remote station whose access request is neglected by an irregular access, by accepting the access request of the remote station, when the lock releasing password is collated and coincidence is obtained. CONSTITUTION:When an irregular user requests a regular access after the irregular access is performed by an irregular user, the denial of the access request of the remote station is permitted to release, and also, the repeating of the trial of the irregular access is prevented from occurring, and simultaneously, the acceptance of the regular access is restarted from the remote station. In other words, a modem device 1 at a center side receives the lock releasing password by a transmission/reception part 8, and confirms the registration of the lock canceling password on a memory part 7 by a control part 9, and the acceptance denial of the access request to the remote station is released if the lock releasing password is correct, and the input request of a user password is transmitted by an instruction to the transmission/reception part 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a system for preventing unauthorized access during callback in a data communication system using a public line.

(Prior Art) Conventionally, in this type of unauthorized access prevention method, the user password, telephone number, and remote station identification code of a registered user are stored in a memory,
When a remote station user accesses the center side, -
First, the remote station user is identified from the remote station identification code. Then, if the correct user password is entered after that, a callback is performed.

On the other hand, if an incorrect user password is entered, all future access requests from that remote station are refused.

(Problem to be solved by the invention) Therefore, in the conventional unauthorized access prevention method, after an unauthorized user attempts unauthorized access from an authorized remote station, the authorized user cannot perform authorized access. However, since the center side rejects the access request, there is a drawback that data communication between the remote station and the center cannot be resumed until the center side denies the access request.

The purpose of the present invention is to, after unauthorized access by an unauthorized user,
When an authorized user requests all authorized access, by making it possible to cancel the denial of access requests to the remote station, it is possible to prevent repeated unauthorized access attempts by unauthorized users and to accept authorized access. The object of the present invention is to provide a method for preventing unauthorized access that can be restarted from a remote station.

(Means for Solving the Problems) In order to achieve the above object, the unauthorized access prevention method according to the present invention prevents unauthorized access from being sent from the remote station after the public line is connected by a call from the remote station to the center. After the center confirms the station identification code and user password, the center performs a callback and performs data communication between the remote station and the center, and the center side identifies the remote station 3-user using the remote station identification code. After that, if an incorrect user password is entered from a remote station, it will be remembered that unauthorized access has occurred from this remote station, and from then on the center side will respond to access requests from the remote station where unauthorized access occurred, even if the password is correct. In a data communication system configured to refuse acceptance even when a user password is input, a first modulation/demodulation device installed on the center side detects a paging signal from a switched network.

A calling/receiving control unit that sends dial signals to the switching network and controls data communication with a remote station after making or receiving a call, and a user password, telephone number, and remote station identification of a remote station registered in the center. A memory section that stores all codes and unlock passwords to allow access again after unauthorized access occurs, and does not disappear even when the power is turned off, as well as remote station identification codes, user passwords, and unlock passwords from remote stations. A transmitting/receiving unit that receives passwords and transmits and receives other communication data, and a remote station identification code, user password, and unlock password transmitted from a remote station, and a remote station identification code, user password, and unlock password stored in a memory unit. The second modulation/demodulation device of the remote station is equipped with a control unit that compares and verifies the password and t, respectively.
A calling/receiving control unit that detects a paging signal from the switching network, sends a dial signal to the switching network, and controls the data communication with the center after making or receiving the call, and a remote station identification code that is sent to the center. The system is equipped with a memory section that stores data and does not disappear even when the power is turned off, a transmitting/receiving section that transmits the remote station identification code and other communication data, and a control section, so that access requests are not rejected due to unauthorized access. If the remote station inputs the unlock password to the center side, the remote station will be instructed to check the unlock password and, if a match is found, to repay the access request fee. be.

(Example〕 Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing an entire example of a data communication system configured according to the unauthorized access prevention method according to the present invention. Two modems 1.2 are connected via a public line 3.5 and a switched network 4. Center side modem 1
A call origination/reception control section 6, a memory section 7, a transmitting/receiving section 8, and a control section 9 are provided. The call originating/receiving control unit 6 not only detects a calling signal from the switching network 4 and controls the sending of a dial signal to the switching network 4, but also enables data communication with a remote station (modulator/demodulator 2) after originating or receiving a call. control. The memory unit 7 stores the user password, telephone number, and remote station identification code of the remote station (modulator/demodulator fi2), as well as the unlock password for permitting access again after unauthorized access has occurred. It is designed not to disappear even over time. The transmitting/receiving section 8 not only receives remote station identification codes, user passwords, and unlock passwords, but also transmits and receives other communication data. The control section 9 controls each section mentioned above, and also compares the remote station identification code, user password, and unlock password transmitted from the remote station (modulator/demodulator 2) with the contents stored in the memory section 7.

On the other hand, the transmitting/receiving control unit 26 also has the modem/demodulator 2 of the remote station.
, ME% IJ section section 7 A transmitting/receiving section 28 and a control section 29 are provided.

The call originating/receiving control unit 26 detects a calling signal from the switched network 4 via the public line 5, sends a dial signal to the switched network 4, and also enables data communication with the center after originating or receiving a call. Control.

The memory section 27 is different from the memory section 7 of the modem l,
It stores the remote station identification code to be sent to the center.
The remote station identification code is configured not to be lost even when the power is turned off.

The transmitter/receiver section 28 transmits a remote station identification code to the center as well as transmits and receives communication data.

In the above configuration, if unauthorized access is performed from a remote station of a legitimate user, and the center side refuses to accept access requests from that remote station, the center side will refuse to accept access requests from that remote station. The steps and actions for the center to restart are shown below.

FIG. 2 is a diagram for explaining the flow of procedures and operations.

When a dial signal is sent from the call control section 26 of the remote station (modulator/demodulator 2) in response to a user's request, the call signal from the switching network 4 that received this dial signal is detected by the call control section 6 ( 11). The modem 1 connects the public line 3.5 and controls data communication between the modems 1.2 (12).

When data communication becomes possible, the modem 2
The transmitting/receiving section 28 transmits a remote station identification code to the modem 1 on the center side.

As a result, the transmitting/receiving section 8 in the modem 1 is connected to the modem 2.
The control unit 9 receives the remote station identification code transmitted from the
(13).

The control unit 9 confirms that this remote station identification code is registered in the memory unit 7, and determines whether unauthorized access has previously occurred from this remote station (14).

If it is determined that unauthorized access has previously occurred from this remote station, the transmitting/receiving unit 8 transmits to the remote station (modulator/demodulator 2) a request to input an unlock password in order to resume accepting all access requests. (15)
.

In response to this request, if an unlock password is sent from the remote station side to the center side (16), the modem device 1 on the center side receives this unlock password via the transmitting/receiving section 8, and the control section 9 Confirm that this unlock password is registered in the memory section 7 by (
17].

At this time, if the four-way release password is correct, the denial of acceptance of the access request to this remote station is canceled and the transmitting/receiving section 8 is instructed to transmit a user password input request (18).

If the user password is sent from the remote station to the center in response to this request (19).

The modem device 1 on the center side receives all the user passwords through the transmitting/receiving section 8. Then, the control unit 9 confirms that this user password is also registered in the memory unit 7 (20).

If the Kono user password is also correct, the control unit 9 disconnects all public lines 3.5 and calls back the remote station telephone number registered in the memory unit 7 (22
), it becomes possible to perform data communication between the modulation and demodulation devices 1 and 2.

During the above procedure, if any one of the remote station identification code, unlock password, and user password is incorrect, the denial of access to that remote station will not be canceled, and the data communication is not possible.

For remote stations that have not been accessed illegally,
No request is made to enter an unlock password.

(Effects of the Invention) As described in detail above, the unauthorized access prevention method according to the present invention is effective in preventing unauthorized access from a remote station identified by a remote station identification code on the center side when an unauthorized user attempts unauthorized access at a remote station. Even when refusing to accept an access request from a remote station, if an authorized user inputs a correct unlock password at the time of the authorized access request, the center's refusal to request access to the remote station can be canceled. Therefore, it is possible to prevent repeated attempts at unauthorized access by unauthorized users of the remote station, and it is also possible to resume accepting legitimate accesses from the remote station.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the unauthorized access prevention method according to the present invention, and FIG. 2 is an explanatory diagram for explaining the communication procedure of the present invention. 1.2...Modulator/demodulator 3,5...Public line 4.
...Switching network 6...Call originating/receiving control section 7...Memory section 8...Transmitting/receiving section 9...Control section

Claims (1)

[Claims] After the public line is connected by a call from the remote station to the center, the center confirms the remote station identification code and user password sent from the remote station, and then performs a callback to initiate data communication between the remote station and the center. In this security system, after the center side identifies the remote station user using the remote station identification code,
If an incorrect user password is entered from a remote station, the center will remember that unauthorized access has occurred from this remote station, and from then on, the center will respond to access requests from the remote station where unauthorized access occurred, even if the correct user password is entered. In a data communication system configured to refuse reception even when a message is input, a first modem device installed at the center side detects a paging signal from a switched network and sends a dial signal to the switched network. A call origination/reception control unit that controls data communication with a remote station after sending and receiving a call, as well as the user password, telephone number, and remote station identification code of the remote station registered in the center, and after unauthorized access occurs. A memory section that stores the unlock password to permit access again and does not disappear even when the power is turned off, and reception of remote station identification codes, user passwords, and unlock passwords from remote stations, and other communication data. The transmitting/receiving unit that transmits and receives the data compares the remote station identification code, user password, and unlock password transmitted from the remote station with the remote station identification code, user password, and unlock password stored in the memory unit. The second modem of the remote station is capable of detecting a calling signal from the switching network, sending a dialing signal to the switching network, and performing data communication with the center after originating or receiving a call. A sending/receiving control unit that controls the transmission, a memory unit that stores the remote station identification code to be sent to the center and does not disappear even when the power is turned off, and a transmitting/receiving unit that sends the remote station identification code and other communication data. and a control unit, and if an unlock password is input to the center side from a remote station whose access request has been rejected due to unauthorized access, the unlock password is checked and if a match is found, the remote station is On the other hand, the unauthorized access prevention method is characterized in that the reception of the access request is configured to be repeated.