A-Kad: an anonymous P2P protocol based on Kad network

With the growth of decentralized network users, preserving privacy becomes a critical issue in this open community. Kad-based network, as a typical decentralized system, has been widely used nowadays. However, there is not enough research to achieve anonymity on it. In this paper, we propose an anonymous protocol based on Kad network, named Anonymous Kad (A-Kad), which achieves complete privacy and security for le providers and requesters. A-Kad has the desired property of anonymity and still keeps high efficiency in publishing and querying phases. To achieve anonymity, we establish two anonymous channels which help le providers to anonymously publish le information and securely transfer les. Through these two channels, the le requester can also efficiently query and retrieve les without worrying about exposing its behavior. Moreover, we propose an anonymity degree evaluation model (ADEM) according to three different attacking capabilities and anonymity degree.