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Secure and efficient communication between human being and managed devices is critical for Smart Grid and Smart Home. This article considers the architecture and design of a secure access gateway (SAG) for home area networks. The SAG serves as the interface between the remote users and the managed devices, such that real-time secure monitoring and control of the devices can be achieved through a Smart Phone. We try to address the security and capacity challenges using multilayer techniques. Security enhancement is ensured through network layer protocol development, as well as inherently secure physical layer transceiver design. Capacity improvement is achieved using dynamic resource management. Remote monitoring and control of home/office devices through a Smart Phone is coming closer to us more than ever before.