Enhancing the Wireless System Security based on Chaotic Encryption

Abstract

In the setting of 5th generation, where the amount of information transferred has drastically expanded along with the skills of communication system attackers, the necessity for a strong security system has garnered crucial relevance. This work proposes and experimentally validates a physical-layer based poly technique for securing orthogonal frequency division multiplexing for machine-to-machine communication (OFDM-M2M). The proposed model is based on a 4-D hyper digital chaotic sequences keys generator that is used to provide the necessary keys to encrypt input image data in the spatial domain using two sub-stages of permutation and one-time pad (XOR) before sending the encrypted data to the second layer of security that involves independently scrambling Quadrature Amplitude Modulation (QAM) symbols into a complex plane. The proposed system proved to enhance the capability to withstand exhaustive attacks and making it more difficult for unauthorized attackers to obtain user data. with 4-D hyper digital chaos, high-security levels are achieved in the simulation result with a sizable key space. The simulation results revealed that the proposed secure OFDM system successfully achieved zero BER at SNR=15, whereas a SNR deterioration of 1.5 dB at 10-4 BER has been recorded with respect to unsecure OFDM system which can be tolerated by the robustness of proposed system with massive key space of ~10220, which is adequate to fend off any exhaustive attacks.

Keywords

• ofdm
• quadrature amplitude modulation (qam)
• 4-d hyper digital chaos
• encryption
• signal to noise ratio (snr)