Quantitative control method for denial of service attack and disturbance

Abstract

The invention provides a quantitative control method for denial of service attack and disturbance. The method comprises the following steps: selecting different updating modes for a state predictor according to whether each transmission channel is at a transmission moment and whether the transmission channel is subjected to denial of service attack at the transmission moment; the input of the to-be-stabilized system is obtained again according to the updated state predictor, and then quantitative control over the to-be-stabilized system is achieved according to the input obtained again. According to the switchable quantization controller designed by the invention, the stabilization control of the system under the conditions that the state quantity is disturbed, the bandwidth of an output channel is limited and the DoS attack exists is realized for the first time. Therefore, even if a disturbed linear system can still keep a normal operation state under the condition that the occurrence frequency and duration of the denial of service attack are limited, the system can be operated normally.

Description

technical field [0001] The invention belongs to the field of cyber-physical system security, and in particular relates to a quantitative control method for denial of service attacks and disturbances. Background technique [0002] The rapid development of computing level and communication technology makes Cyber-Physical Systems (CPSs) become the focus of people's attention. This system integrates network resources and physical systems. This feature makes it show great advantages in resource sharing and remote distributed control, so it is widely used in various engineering systems. For example, smart grids, smart homes, driverless cars, etc. Since most application scenarios have high requirements for system security, the security analysis of CPSs under network attacks has become the focus of scholars. [0003] There are many types of network attacks, and the common ones can be listed as: false data injection attacks, replay attacks, denial of service attacks (DoS) attacks, ...

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Problems solved by technology

On the other hand, J.Hespanha et al. invented a technique based on the differential pulse modulation mechanism (DPCM) to update the range of the quantizer, although this method is compared to the "zooming-in" and "zooming-out" methods More complex, but requires less data transfer bit rate

[0005] The above discussion shows that the two factors of insufficient bit rate in the network channel and the failure of transmission can endanger the stability of the CPS system

However, there are very few inventions for controller design that take these two factors into consideration at the same time, so it is imminent to fill the gap in this field

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