To address the problem of privacy protection in satellite communication, according to the proposed new three-dimensional chaotic system, this paper achieves the concealment of picture information by one-dimensional index scrambling and encryption operation in QPSK modulation for 24-bit true color pictures and completes the reception and decryption of ciphertext picture data and recovery of picture information at the receiver side. Through the simulation of the encryption algorithm, it is proved that the encryption system has better encryption than the classic logistics chaos encryption system and has the ability to resist statistical analysis attack, differential attack and noise interference. The whole image encryption system is implemented on FPGA, which proves its great potential for future application in satellite communication.
This paper proposes a novel 5-dimensional hyperchaotic coupling synchronization system for physical layer security in OFDM satellite systems. The proposed approach is designed based on the Lyapunov stability theory. The proposed chaotic-based satellite data encryption/decryption system is validated using a numerical simulation study. Additionally, to demonstrate the efficiency of the proposed chaotic encryption structure, we analyzed its key space. The proposed chaotic encryption structure is very sensitive to the initial key, and a tiny discrepancy as small as 10−19 would lead to a completely different sequence. The key space of the proposed scheme is up to 10340.
Ensuring information security is of great significance to a satellite communication system. In this paper, a chaotic encryption scheme is proposed for a satellite communication system. Firstly, five chaotic sequences are generated by a five-dimensional chaotic system. And then, XOR, scrambling and interpolation are performed on the data in turn. The simulation results show that the bit error rate of this method approaches 0 when the SNR is greater than 18, and the bit error rate of the illegal receiver is as high as 35.3% when the correct key is unknown. Therefore, secure communication can be achieved.
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