Multiple layer text security using variable block size cryptography and image steganography

摘要

Information security is the major concern now a day since number of internet users is increasing and secret information is getting shared every second. This has also hiked the cyber crime and threat of malicious access. The two main techniques that are used for information security are steganography and cryptography. Cryptography is basically secret writing; on the other hand Steganography is data hiding. In this paper, a hybrid technique is introduced by combining the cryptography and Steganography properties. Also for data encryption vary the block size in place of fixed block. The proposed image steganography algorithm works on spatial domain. LSB method is used for data hiding in different ways. The aim of this work is to design an algorithm for text security as well as improve MSE and PSNR value. The data hiding capacity is also considered. The technique has been designed and simulated in MATLAB 2013a using different format images. Also Qualitative and Quantitative analysis is done and compared with the existing results.