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Distributed consensus requires the consent of more than half of the congress to produce irreversible results, and the performance of the consensus algorithm deteriorates with the increase in the number of nodes. This problem can be addressed by delegating the agreement to a few selected nodes. Since the selected nodes must comply with the Byzantine node ratio criteria required by the algorithm, the result selected by any decentralized node cannot be trusted. However, some trusted nodes monopolize the consensus node selection process, thereby breaking decentralization and causing a trilemma. Therefore, a consensus node selection algorithm is required that can construct a congress that can withstand Byzantine faults with the decentralized method. In this paper, an algorithm based on the Byzantine agreement among decentralized agents to facilitate agreement between decentralization nodes is proposed. It selects a group of random consensus nodes per block by applying the proposed proof of nonce algorithm. By controlling the percentage of Byzantine included in the selected nodes, it solves the trilemma when an arbitrary node selects the consensus nodes.

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This paper is related with a stateful intrusion detection technology which is based on session state tracking in network intrusion detection systems(NIDSs). Today's network security systems are required high-performance as well as good functionality since the speed of the internet is increasing. But most of the software-based NIDSs(e.g. Snort) show inefficiency and even fail to perform for thefaster internet. In this paper, we provide hardwarebased stateful intrusion detection module to overcome these shortcomings of software-based solutions. By implementing stateful intrusion detection module in FPGA, we can solve the problem ofperformance and has capability of intrusion detection in future multigigabit network environment. In addition, we can improve the accuracy of intrusion detection with reducingfalse positive alerts.