An Energy-Efficient Privacy Preserving Security-Oriented DSA With Low Latency

Conventional cryptography techniques based upper layer secure wireless communication solutions are often subject to major issues such as complex key management, high computational complexity, etc. Physical layer security mechanisms are proposed as appealing alternative solutions for secure wireless communications. However, existing physical layer security schemes each faces some major limitations including limited achievable secrecy capacity, sensitive to time-varying channel status, high power consumption and long delay. To tackle these issues, we propose a novel energy efficient security-oriented dynamic spectrum allocation/assignment (S-DSA) algorithm to provide message privacy (confidentiality) with low latency. Our S-DSA algorithm solves the radio resource (spectrum and power) allocation and privacy preserving problems jointly, which is modeled as a mixed-integer multi-objective optimization problem. The branch and bound mechanism integrated with non-dominated sorting genetic algorithm-II (NSGA-II) is proposed to search the optimal channel and power allocation strategy to maximize the achievable system secrecy capacity and minimize the latency and power consumption simultaneously. Simulations confirm that the confidentiality achieved by our serenity-oriented DSA induces negligible degradation on average throughput per user compared with exiting DSA schemes.