Enhancing Physical Layer Security via Information Hiding and Chaotic Frequency-Hopping Signal

Abstract

With the development of super computation ability and invention of quantum computer, the conventional calculation quantity based encryption system suffers great impact. Safeguarding data confidentiality in physical layer of wireless satellite communication system has attracted many eyes from academia and industry. In this paper, we propose a groundbreaking revolution method to enhance physical layer security (PLS) by information hiding technique, that is, embedding secret information into chaotic frequency-hopping signal using MFSK modulation. First, secret information to be transmitted is encrypted with chaotic binary sequence. Secondly, according to frequency-hopping pattern, select suitable modulation order and specific frequency corresponding to each encrypted data block under chaotic address sequence. Finally, the encrypted information is embedded into frequency-hopping Sine signal by MFSK modulation. The experimental results indicate that the proposed scheme is robust against various jamming attacks, such as power attenuation, noise adding, single-tone jamming, key exhaustive search, etc.