Network coding is able to address output conflicts when fanout splitting is allowed for multicast switching.Hence,it successfully achieves a larger rate region than non-coding approaches in crossbar switches.However,network coding requires large coding buffers and a high computational cost on encoding and decoding.In this paper,we propose a novel Online Network Coding framework called Online NC for multicast switches,which is adaptive to constrained buffers.Moreover,it enjoys a much lower decoding complexity by a Vandermonde matrix based approach,as compared to conven-tional randomized network coding Our approach realizes online coding with one coding algo-rithm that synchronizes buffering and coding.Therefore,we significantly reduce requirements on buffer space,while also sustaining high throughputs.We confirm the superior advantages of our contributions using empirical studies.
Trust management frameworks are used to evaluate and manage trust relationships between network nodes and enhance network security.However,trust management frameworks themselves are vulnerable to attacks.Attacks against trust management frameworks are described in this paper with a trust management framework to resist them.The trustworthiness between nodes is evaluated to classify node behavior using a three-dimensional classifier based on a fuzzy integral.Different behaviors are mapped to different behavioral spaces to detect malicious nodes and identify their behavior types.The security of ad hoc networks is then improved by various measures to handle different types of malicious behavior.Simulations of the model on the System In The Loop (SITL) platform show that this trust management framework can separate normal nodes and malicious nodes and can distinguish different types of malicious nodes.
