A Robust Multilevel Security Mechanism against Geometric Attacks

摘要

The need for secured data communication in today's world is a prime concern of every internet user facing various security assaults. To cope up in such a hostile environment, various researchers have proposed the use of multiple levels of securities which combine cryptography and steganography. The most common approach in literature uses spatial domain steganography technique coupled with symmetric key cryptography. Though, spatial domain steganography possess a rich PSNR value and a good perceptual quality however, it's robustness against geometric attacks is less. Therefore, this paper proposes a robust multilevel security mechanism which inculcates transform domain steganography technique combined with hierarchical visual cryptography. To enrich the data embedding capacity, Huffman compression is also added. The proposed mechanism is implemented in MATLAB-2012 and the result shows that the technique is far better against attacks than the other ones available in literature.