PoAS: Enhanced Consensus Algorithm for Collaborative Blockchain Intrusion Detection System

Signature-based Collaborative Intrusion Detection System (CIDS) deeply depends on the reliability of nodes to produce attack signatures. Each node in the network is responsible to produce a new attack signature to be distributed with other nodes. There is an issue that exists in CIDS highlighted in this paper, it is to maintain trust between the nodes while distributing the attack signatures. Recently, researchers found that blockchain has great potential to solve those problems. A consensus algorithm in the blockchain is capable to improve trust between the nodes. The object of this work to is design an extension of the Chain-based consensus algorithm to satisfy the requirement. The extensions name it as Proof of Attack Signature (PoAS). In the evaluation, the outcomes showed that the PoAS consensus algorithm successfully produces trusted attack signatures, and improved the robustness of CIDS, when compared to the network without the PoAS.