ADVANCED STEGANOGRAPHIC TECHNIQUE FOR BOTH COLORED AND GRAY-SCALE IMAGES
Shailendra Singh · 2015
The internet as a whole does not use secure links, thus information in transit may be vulnerable to interception as well. It is important to reduce the chances of the information being detected during the transmission. This is an important issue now-a- days. Thus, there must be some solution to solve the problem, so as to pass information in a manner that the very existence of the message is unknown to third person or attacker in order to repel attention of the potential attacker. This paper defines the various techniques used for information hiding, their applications and also discusses the drawbacks of implementing those techniques independently. The motivation for this paper includes provision of protection of information during transmission without any detection of information. In the present work, it has been observed that steganography is the solution for given problem as in this technique, existence of data is not evident. Among various types of steganographic techniques, image steganography is best solution. In the past few years a large number of algorithms for image steganography have been developed n order to have better imperceptibility, a mathematical method 2 k correction has been used. This method corrects each pixelvalue as 2 k . This means if k-bits are embedded in a pixel value the method adds or subtracts 2 k to each pixel-value and finally the corrected pixel value becomes closer to the original-pixel. Hence, the secret data in the stego-pixel is