Secure image transmission through LTE wireless communications systems
DOI:
https://doi.org/10.1186/s13640-024-00619-2Keywords:
Cryptography , DFT , DCT , DST , OFDMA , RSA , Secure wireless image transmissionAbstract
Secure transmission of images over wireless communications systems can be done
using RSA, the most known and efficient cryptographic algorithm, and OFDMA,
the most preferred signal processing choice in wireless communications. This paper
aims to investigate the performance of OFDMA system for wireless transmission
of RSA‑based encrypted images. In fact, the performance of OFDMA systems; based
on different signal processing techniques, such as, discrete sine transforms (DST)
and discrete cosine transforms (DCT), as well as the conventional discrete Fourier
transforms (DFT) are tested for wireless transmission of gray‑scale images with/without
RSA encryption. The progress of transmitting the image is carried by firstly, encrypting
the image with RSA algorithm. Then, the encrypted image is modulated with DFT
based, DCT‑based, and DST‑based OFDMA systems. After that, the modulated images
are transmitted over a wireless multipath fading channel. The reverse operations will be
carried at the receiver, in addition to the frequency domain equalization to overcome
the channel effect. Exhaustive numbers of scenarios are performed for study and inves
tigation of the performance of the different OFDMA systems in terms of PSNR and MSE,
with different subcarriers mapping and modulation techniques, is done. Results
indicate that the ability of different OFDMA systems for wireless secure transmission
of images. However, the DCT‑OFDMA system showed superiority over the DST‑OFDMA
and the conventional DFT‑OFDMA systems.
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