KOMBINASI STEGANOGRAFI BIT MATCHING DAN KRIPTOGRAFI DES UNTUK PENGAMANAN DATA

Abstract

In this research, has been discussed about combination of steganography and cryptography to secure data without change the quality of cover medium. Steganographic methods used to matching the message bits on the MSB bit of image cover. Matching process is done by divide and conquer method. It will be result a bit position index, then encrypted using cryptographic DES (Data Encryption Standard). The input are text message, image, and key. The output is ciphertext bit index which can be used to secure the messages. To read the contents of the message, we require the same image cover and key. Outcomes of proposed method can be used to secure the data. The advantages of this method, such as the image quality has not changed and the capacity of stored messages can be larger than the image. Acoording to the research that grayscale or color images can be used as a image cover, except the image contain 100% black and 100% white. Bit matching process on image which have much variety of color need less time. The damage of messages in addition of noise salt and pepper start from 0,0067 of MSE value and gaussian strat from MSE 0,00234