关键词: 移动自组织网, 证书颁发（CA）, 轮转CA, 认证, 共识机制

Abstract: Mobile Ad Hoc network, a distributed network independent of the fixed infrastructure, is formed by a group of autonomous wireless nodes or terminals cooperating with each other. It has the characteristics of centerless, self-organizing and multi-hop routing. However, the shortcomings such as frequent dynamic topology and limited energy in mobile Ad Hoc networks make it difficult to perform complex authentication. For this problem, a light-weight and rotational CA (certificate authority) scheme based on consensus mechanism is put forward, which combines the idea of lightweight CA and draws on the consensus mechanism in the blockchain to elect CA. The current CA is periodically elected through the consensus algorithm, and CA can be determined after the entire net-work quickly reaches a consensus, thus lightweight CA can be achieved. The scheme does not require certificate management, and the CA node periodically rotates, which is especially suitable for mobile Ad Hoc networks with highly dynamic changes and short life cycles. This paper analyzes the security of the scheme in detail and forma-lizes it based on the BAN  logic analysis method. Theoretical analysis shows that this scheme can resist DoS (denial of service) attacks, counterfeit attacks and other network attacks to a certain extent, enhancing mobile Ad Hoc network security.

Key words: mobile Ad Hoc network, certificate authority (CA), rotational CA, certification, consensus mechanism