Efficient Transmission of Secure Images with OFDM using Chaotic Encryption

Information security considered as one of the main goals when it is transmitted through a wireless communication or even it is required to be saved in a PC. Incorporation of a secure and highly reliable of digital data such as (video, audio, images or text) that be required to transmit from source to destination through a communication channel, is turning into a top of the requirements in present-day wi-fi communications. There are two phases to achieve confidentiality, the data level and the network level. Cryptographic techniques are using in data level security. This study focuses on data-level security phase to establish a secure image transmission through an AWGN channel, where (OFDM) the Orthogonal Frequency Division Multiplexing system is used with different encryption techniques, using cipher, permutation, and scrambling algorithms to ensure secure image transmission using MATLAB program. Several statistical tests were used to check the encryption quality, which are entropy, correlation coefficient, NPCR, UACI, histogram. On the other hand, the image transmission quality is evaluated by Bit-Error-Rate at different SNR conditions, BER, and Peak-Signal-to-Noise Ratio, PSNR. The numerical analysis shows that the tow stage-OFDM system proposed present an overall performance improvement among the earlier cryptosystems. The statistical analysis tests show that this system is considered as simple and robust algorithm from security point of view.