Dual Protection on Message Transmission based on Chinese Remainder Theorem and Rivest Cipher 4

Abstract

This research proposes a combination of dual protection on text messages transmission using Chinese Remainder Theorem (CRT) steganography and Rivest Cipher 4 (RC4) encrypting method. This combination aims to optimize the performance of encryption and message insertion into an image. Security This message is done by encrypting text messages using RC4 first, then the results are embedded in the grayscale type container image with the CRT method. The evaluation standards that will be used in this research are Mean Square Error (MSE), Peak Signal to Noise Ratio (PSNR), Structural Similarity Index Metric (SSIM), and Character Error Rate (CER). MSE, PSNR and SSIM are used as a measure of the quality of stego images. To determine the performance of the proposed method, message insertion is carried out in three types of sizes, namely maximum payload, half payload and one quarter payload. While the CER is used to find out the results of decryption of text messages. The resulting CER value is 0, this indicates the message was extracted and decrypted perfectly.