Research And Application Of Digital Image Information Hiding Technology

With the rapid development of Internet and the modern telecommunication technology, information hiding technology has become a new hot topic in the domain of information security. The principle of information hiding technology is embedding private messages in the redundant information of the carrier. It gets the security of communications through hiding the existence of the communication process. As a new domain of information security, information hiding plays a more and more important role in covert communication and copyright protection, especially in the domain of military affairs and national security which have higher requirements on the confidentiality and security of information.This paper studies on the information hiding technology using digital image as the carrier and focuses on the following aspects to analyze and research. This paper first introduces basic theory of information hiding technology and basic knowledge of the digital image. Also,the main algorithms of information hiding technology are simply introduced. Subsequently, the paper analyzes and discusses the encryption technology which is used to pretreat information. The combination of encryption technology and information hiding technology can better guarantee information security. This part is mainly about the analysis of the relationship between information hiding and encryption, as well as the research and implementation of text information encryption algorithm RSA and image scrambling algorithm Arnold. Then the paper focuses on spatial domain algorithm and the traditional information hiding algorithm Least Significant Bit (LSB) is improved associated the spatial domain visual model. The improved algorithm embeds information in the random sequence position to improve the security of information hiding algorithm and change different digits of carrier images RGB component according to the brightness formula in keeping the good apperceiveness while improving the hidden rate. Also,the information hiding system of improved algorithm was implemented and the experimental results were analyzed, the results showed that the algorithm had large hidden capacity and the hidden effect was good. Finally, the frequency-domain algorithm is studied and a kind of hiding information algorithm of frequency domain based on Discrete Wavelet Transform (DWT) is simulated. The simulation results were analyzed and the results verified that the algorithm is effective and robust.