JP3194285B2 - Security monitoring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security monitoring system for a security device used for communication and data security.

[0002]

2. Description of the Related Art Conventionally, this type of security monitoring system employs a system in which data is encrypted and transmitted on a transmission side, and encrypted data is decrypted on a reception side. I keep it. Then, in order to monitor the secret synchronization status of the encrypted data, special monitoring data is incorporated in the encrypted data and transmitted.

[0003]

The above-described conventional security monitoring system employs a system in which monitoring data is embedded in encrypted data and transmitted, so that the data to be transmitted becomes longer, and transmission takes a longer time. It will cost. On the other hand, it is conceivable to transmit the encrypted data and the monitoring data through different systems. There is a possibility that the secret synchronization status of data cannot be monitored accurately.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the transmission time can be reduced by transmitting encrypted data and monitoring data through different systems, and furthermore, data concealment is possible. An object of the present invention is to provide a confidential monitoring method capable of accurately monitoring a synchronization status .

[0005]

In order to achieve the above object, the present invention provides a transmitting means for converting original data into an concealed signal and transmitting the concealed signal to a receiving side; Monitoring data generating means for generating monitoring data for monitoring the concealment synchronization state from the original data, and monitoring by adding a frame signal indicating a deviation of the monitoring data from the concealment signal on the receiving side to the monitoring data. Forming a signal, having a frame signal adding means for transmitting the monitoring signal in a different system from the concealed signal, on the receiving side, a conversion means for receiving the concealed signal and converting it to restored data,
By detecting the deviation of the monitoring data from the frame signal and detecting the deviation from the concealment signal from the frame signal, a deviation correcting unit that corrects the deviation of the monitoring data, the monitoring data with the deviation corrected, and A configuration is provided that includes comparison means for comparing the restored data with the restored data to monitor the secret synchronization state of the secret signal.

[0006]

According to the present invention, the concealment signal and the monitoring signal are transmitted from the transmission side to the reception side in different systems, and the reception side
The deviation of the monitoring data included in the monitoring signal from the concealment signal is corrected, and the concealment synchronization state of the restored data obtained by converting the concealment signal is monitored by the corrected monitoring data.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a security monitoring method according to the present embodiment. Reference numeral 1 denotes a transmitting side of the present system, and reference numeral 10 denotes a receiving side. On the transmitting side 1, a conversion unit 2 for concealing (encrypting) the original data and outputting a concealed signal, and a monitoring data generation unit 3 for generating monitoring data from the original data
And a frame signal adding unit 4 that adds a frame signal to the monitoring data to create a confidential monitoring signal.
Here, the monitoring data is transmitted to the receiver 10 of the concealed signal.
This is data for monitoring the secret synchronization state. And
The frame signal is a signal indicating a deviation in reception synchronization between the monitoring data and the concealment signal on the receiving side 10, and this concealment monitoring signal added before the monitoring data is transmitted from the frame signal adding unit 4 to the receiving side To be transmitted to.

[0008] On the receiving side 10, an exchange unit 1 for restoring (decoding) the received concealed signal and outputting restored data.
1, a frame detecting unit 12, a shift detecting unit 13, a shift correcting unit 14, and a comparing unit 15. The frame detection unit 12 detects a frame signal from the received confidential monitoring signals at the time of initial synchronization, and outputs the frame signal to the displacement detection unit 13.

A shift detecting unit 13 detects a shift in reception synchronization between the concealment signal received by the conversion unit 11 and the monitoring data based on the input frame signal, and outputs a signal indicating the shift to a shift correcting unit 14. It has the function of outputting to The shift correcting unit 14 has a function of correcting the shift of the monitoring data with respect to the concealment signal based on the signal from the shift detecting unit 13 and outputting the corrected monitoring data to the comparing unit 15.

The comparing section 15 compares the monitoring data from the shift correcting section 14 with the restored data from the converting section 11 to judge whether or not the concealment of the concealment signal is normally performed. Yes, re-synchronization is performed when the concealment synchronization state of the concealment signal is broken.

Next, the operation of this embodiment will be described.
On the transmitting side 1, the concealment signal is output from the conversion unit 2, the frame signal is added to the monitoring data from the monitoring data generation unit 3, and the concealment monitoring signal is output. Therefore, since the concealment signal and the concealment monitoring signal are transmitted from the transmission side 1 to the reception side 10 in different systems, the transmission time of the concealment signal is extremely short.

On the receiving side 10, the concealed signal is
Then, the frame signal of the confidential monitoring signal is input to the shift detecting unit 13 via the frame detecting unit 12, and the monitoring data of the confidential monitoring signal is input to the shift correcting unit 14. Then, by the displacement detecting unit 13,
A deviation of the monitoring data with respect to the concealment signal is detected, and the deviation is corrected by the deviation correcting unit 14. As a result, the corrected monitoring data is input to the comparing unit 15 without deviation from the restored data. Therefore, the confidential synchronization state of the restored data can be accurately monitored by the monitoring data input to the comparing unit 15.

[0013]

As described above, according to the present invention, since the concealment signal and the monitoring signal are transmitted by different systems, the transmission speed is high. Moreover, even if the monitoring data included in the monitoring signal is received with a deviation from the concealment signal, the deviation of the monitoring data is corrected, so that the confidential synchronization state of the concealment signal is accurately monitored by the monitoring data. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a security monitoring method according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transmission side 2 ... Conversion part 3 ... Monitoring data generation part 4 ... Frame signal addition part 10 ... Reception side 11 ... Conversion part 12 ... Frame detection part 13 ... Displacement detection part 14 ... Displacement correction part 15 ... Comparison part

Claims (1)

(57) [Claims] A transmitting means for converting the original data into an concealed signal and transmitting the concealed signal to a receiving side; and monitoring data for monitoring the concealed synchronization state of the concealed signal on the receiving side from the original data. Monitoring data generating means for generating; and adding a frame signal indicating a deviation of the monitoring data with respect to the concealment signal on the receiving side to the monitoring data to form a monitoring signal, and separating the monitoring signal from the concealment signal. A frame signal adding unit that transmits the data in a system, and a receiving unit that receives the concealed signal and converts the concealed signal into restored data. By detecting a shift with respect to the concealment signal, a shift correction unit that corrects the shift of the monitoring data, and comparing the monitored data with the shift corrected and the restored data, A concealment monitoring method, comprising: comparison means for monitoring a concealment synchronization state of the concealment signal.