A secured key issuing protocol for peer-to-peer network

Identity-based cryptography (IBC) was introduced into peer-to-peer (P₂P) networks for identity verification and authentication purposes. However, current IBC-based solutions are unable to solve the problem of secure private key issuing. In this paper, we propose a secure key issuing system by using an IBC for P₂P networks. We present an IBC infrastructure setup phase, peer registration solution by using Shamir´s (k, n) secret sharing, and secure key issuing the scheme, which accepts key privacy authorities (KPAs) and key generate centre (KGC) to securely issue private keys to the peers in order to enable the IBC systems to be applicable and more acceptable in real-world P₂P networks. Moreover, for maintaining the security of KPAs, we are developing a system to authenticate KPAs using Byzantine fault tolerance protocol. The theoretical analysis and experimental results are shows that performance of SKIP is very efficiently and effectively, and it can support large scale systems.