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Secure Communication Based on Fountain Code and Channel Feedback

This paper proposes an adaptive security transmission scheme based on fountain code and channel feedback. The fountain code has such a characteristic that as long as the legitimate user correctly collects sufficient fountain packets before the malicious user does, information leakage can be voided and secure communication can be realized. Inspired by this insight, we develop a fountain coding mechanism which dynamically adjusts the fountain code construction via the feedback channel. Moreover, transmit power control is employed to enhance the rate of packet reception of the legitimate receiver. We analyse the performance of our scheme in terms of intercept probability and QoS violating probability. Numerical simulations verify our theoretical analysis results, and demonstrate that the proposed scheme enhances the system secrecy and reduces the decoding delay compared with the other previous schemes.