PENGAMANAN DATA TEKS DENGAN KOMBINASI CIPHER BLOCK CHAINING DAN LSB-1
There are several approaches to secure a data techniques that are still used by some circles among them by applying cryptographic techniques, steganography techniques, watermarks and other techniques. One technique that can be done to optimize the security of text data is to combine cryptographic techniques with steganography techniques. Cryptographic techniques serve to encrypt the text data is concealed through the process of encryption, while steganography techniques serve to hide (embedded) encrypted text data into a media such as images, video or audio. The algorithm of cryptographic techniques used in this case is the Cipher Block Chaining (CBC) algorithm invented by IBM in 1976 that implements a feedback mechanism on a block wherein the previous block will be fed back with the current block. The method used to hide encrypted messages on a medium is one of the modifications to the Least Significant Bit method, Least Significant Bit-1 (LSB-1). The LSB-1 algorithm works by replacing each of the 7th bits of the container medium with encrypted text bits. The collecting media (cover image) used in this case is a true color digital image.