Trust model based on isolated forest in UASNs

Abstract

The invention belongs to the technical field of wireless sensor network security, and discloses a trust model based on an isolated forest in UASNs. Firstly, trust items needing to be evaluated are divided into four types including communication trust, data trust, energy trust and environment trust, and particularly, in the data trust calculation process, the similarity between overall data distribution and theoretical data distribution in UASNs is considered besides the difference between a single node and overall data distribution. Due to the fact that environmental noise can influence communication and data transmission between nodes, energy changes are caused, evaluation errors of other trust items can be reduced by increasing environmental trust, and the accuracy of malicious detectionis improved. Then, the four trust items as a trust training set is taken, and a node trust model is established by adopting an isolated forest algorithm; and finally, reliability evaluation is performed on the nodes in the UASNs based on the node trust model, attacks of abnormal nodes and malicious nodes in the UASNs are effectively detected, and network security threats are reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor network security, in particular to an isolated forest-based trust model in underwater acoustic sensor networks (UASNs). Background technique [0002] Underwater Acoustic Sensor Networks (UASNs) can play meaningful roles in various fields, such as battlefield surveillance, smart ocean, emergency response, target tracking, and marine ranching, etc. UASNs is a multi-hop self-organizing distributed sensor network, which is composed of a large number of tiny sensor nodes with sensing capabilities. Usually, sensor nodes are randomly deployed in unattended areas and harsh environments to perform various complex tasks and are vulnerable to Different kinds of security threats. Although traditional security methods based on encryption or authentication can defend against external attacks, they cannot effectively detect internal attacks from compromised nodes. For example, in some cases, by capturi...

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Problems solved by technology

For example, in multidimensional trust, researchers are required to assign impact factors subjectively, which leads to inaccurate trust evaluation; some studies only combine direct observation and indirect observation to calculate trust without considering energy constraints, which may shorten the life of the network; In addition, although some studies have considered the movement of node positions caused by water flow movement, none of the existing work has considered the impact of environmental noise (such as turbulence, boat activities, wind and thermal air flow) on trust evaluation calculations.

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