Patent ID: 11876810
Assignee: DAEGU GYEONGBUK INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 0:
1. A method of detecting a malicious node in a bus network system, comprising:
pre-storing, by a receiving node, autocorrelation characteristics and node identifiers for each signal received from nodes excluding the receiving node in a bus network system, wherein the autocorrelation characteristic divides any one of the signals that the receiving node receives from other nodes through a bus into a plurality of samples in units of predetermined time interval or a frame length, and is a value obtained by calculating a correlation between any one and the remaining samples of the plurality of samples;
receiving, by the receiving node, a target signal from any one of the nodes;
generating, by the receiving node, an autocorrelation characteristic of the target signal;
searching for an autocorrelation characteristic, which is identical to the autocorrelation characteristic of the target signal or similar to the autocorrelation characteristic of the target signal by a reference level or more, among the autocorrelation characteristics of each of the signals stored by the receiving node;
determining, by the receiving node, whether a first node identifier matching the searched autocorrelation characteristic and a second node identifier extracted from a packet transmitted to the target signal are the same; and
when the first node identifier and the second node identifier are not the same, determining, by the receiving node, any one node as the malicious node.