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In recent years with the improvement of information communication technology (ICT) and wireless communication, Online Trading Environment (OTE) has become a popular E-commerce platform to connect sellers and buyers in an efficient way. As, OTE’s are increasing in a wider range, the authentication and verification of entities in OTE network becomes a challenging task. Although, some authentication schemes exist in OTE’s, they have flaws such as account creation delays, authentication delays, communication cost and user privacy. In this work, a trustworthy and secure anonymous authentication scheme is proposed to prevent malicious users to enter into the OTE network. In addition, our proposed scheme provides conditional privacy to users until they maintain a genuine relationship with other entities without compromising. If any dispute occurs, then the system will revoke the access of that particular entity. Moreover, the security and performance analysis in this work concludes that our scheme ensures a secure interface to provide sustainable trading experience to users by taking less computation cost and communication delay when compared to other existing authentication schemes.近年来，随着信息通信技术（ICT）与无线通信技术的不断进步，在线交易环境（Online Trading Environment, OTE）已成为高效对接买卖双方的主流电子商务平台。随着OTE应用场景的持续拓展，对OTE网络内实体的身份认证与核验工作逐渐成为一项极具挑战性的任务。尽管当前已有部分针对OTE的身份认证方案，但此类方案仍存在账户创建时延过长、认证时延偏高、通信成本较高以及用户隐私保护不足等诸多缺陷。针对上述问题，本文提出一种可信且安全的匿名身份认证方案，以阻止恶意用户接入OTE网络。此外，本方案可为用户提供条件性隐私保护：只要用户与其他实体保持合法合规的交易关系且未实施违规行为，其个人隐私即可得到充分保障；一旦发生交易纠纷，系统即可撤销对应实体的访问权限。此外，本文通过安全性与性能分析验证得出结论：相较于现有同类身份认证方案，本方案仅需更低的计算开销与通信时延，可搭建安全可靠的交易接口，为用户带来可持续的优质交易体验。