A Proposed Encoding and Hiding Text in an Image by using Fractal Image Compression

摘要

The problem of protecting data and information originates from the dependency upon encryption and steganography separately. Therefore, it is easy to break them and detecting the contents of the secret massages available in data, pictures, texts or audios. To add multiple layers of security our research proposed an algorithm that can hide a text in an image in a such away that prevents as much as possible any suspicion having a hidden text, after RSA cipher. In this research a new hiding method is proposed based on encoding the information by using RSA cryptosystem and hiding the cipher information(ciphertext) by using proposed fractal image compression(FIC). FIC based on IFS exploits the spatial redundancy with it is different parts and they are blocked based algorithm with variable block size that intend to approximate blocks of a determined size with contractive transformation. This blocks based allow hiding capacity to be large.