Due to lack of effective trust management mechanism, heaps of deceptions exist in peer-to-peer (P2P) e-commerce (EC) environments, which seriously damage authenticity and availability of the systems. There are various challenges that are faced in the open autonomous environments. These existing challenges are mostly owing to the scarcity of correct authentication in P2P networks. Generally speaking, structured P2P networks are assumed to be accessible by allowing heterogeneous nodes or clients to interact and share one another. The identity (ID) authentication problem for this type of network has now become important. The paper presents a specific authentication key exchange scheme for P2P networks. Theoretic analysis shows that, a robust evaluation scheme based on elliptic curve cryptography (ECC) is proposed for P2P e-commerce networks with better secure identifying-and-authenticating features.