A Combined Cryptography and Error Correction System based on Enhanced AES and LDPC

Abstract

Any military organization nowadays depend on networks and communications. Sensitive data that is essential to national security relies on these networks and applications. As a result, the need to safeguard and protect this data arises. An authenticated crypto-coding (encryption combined with channel coding) system is developed which incorporates improved Advanced Encryption Standard for security and Low Density Parity Check codes for error correction. Image encryption and decryption is done with AES-256 with authentication. LDPC is incorporated as one of the rounds of Encryption. The entire communication system is implemented and simulated using MATLAB. Encryption-encoding-scramblingmodulation is performed on transmit side. The channel model of Additive white Gaussian noise with varying values of SNRSignal to Noise ratio is used. The results of Bit error rates (BER), no. of errors, recovered images and histograms for different SNR values are added. The parameters like correlation, entropy and noise variance are calculated and verified. The Enhanced encryption offers a higher security compared to conventional AES. Hence, the modified method can be used to safeguard sensitive information