ACT: Anonymous Consensus Based on Tor

Xingyu Li, Ziyu Zheng, Pengyu Chen

Abstract: As the core of blockchain technology, consensus mechanism determines the security, stability and availability of the system. Most of consensus mechanisms including Po-X, X-BFT and so on mainly focuse on the design and improvement of the consensus layer while the privacy of nodes is ignored. It leads to the emergence of node corruption and conspiracy attacks. In this paper, we present ACT, anonymous consensus mechanism for consortium blockchain. ACT uses anonymous communication mechanism, based on Onion Routing Technology Tor, to protect node privacy and prevent the corruption of consensus nodes. To reduce the computational power consumption, ACT abandons the traditional attempt conversion and mining mechanism while double ring threshold signature is adopted. Besides, we design a set of identity authentication mechanism NKC for ACT based on the improved Keberos protocol, which reduces the probability of Byzantine nodes to a certain extent.