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While the open nature of radio propagation enables convenient “anywhere” wireless access, it becomes the root of security vulnerabilities in wireless communications. In light of this, physical-layer authentication, which is based on exploitation of the dynamics of physical layer attributes, is emerging as an effective approach to enhancing wireless security. In this article, we first review the existing physical-layer authentication techniques and identify their current limitations, ranging from low authentication reliability to the difficulties of integrating these techniques with the existing wireless infrastructure and applying them in complex future networks. We then present three promising research areas in addressing these challenges. Specifically, we propose the use of the multi-attribute multi-observation technique for enhancing the authentication reliability. In order to apply pointto- point physical-layer authentication …