Secure Steganography for Digital Images

Abstract

Abstract-The degree of imperceptibility of hidden image in the 'Digital Image Steganography' is mostly defined in relation to the limitation of Human Visual System (HVS), its chances of detection using statistical methods and its capacity to hide maximum information inside its body. Whereas, a tradeoff does exist between data hiding capacity of the cover image and robustness of underlying information hiding scheme. This paper is an exertion to underline the technique to embed information inside the cover at Stego key dependent locations, which are hard to detect, to achieve optimal security. Hence, it is secure under worst case scenario where Wendy is in possession of the original image (cover) agreed upon by Alice and Bob for their secret communication. Reliability of our proposed solution can be appreciated by observing the differences between cover, preprocessed cover and Stego object. Proposed scheme is equally good for color as well as gray scaled images. Another interesting aspect of this research is that it implicitly presents fusion of cover and information to be hidden in it while taking care of passive attacks on it.

Lightweight Security Hardware Architecture Using DWT and AES Algorithms

“…To develop Eqs. (1) and (2), that represent the middle part of the steganographic algorithm, the proposed hardware system is shown in Fig. 4.…”

“…In this way, each memory location represents an element of the matrix, so the zero location in memory represents the element h 11 of the matrix H, the location 1 represents the element h 12 and so on. Equations (1) and (2) indicate multiplication of matrices, from the hardware perspective, these operations are about multiplication between data H and F, and the Address generator produces different address to store the h in data belonging to row i of H and the component f n j belonging to column j of F to perform Eq. 3.…”

“…There are several methods to secure the information transmission through non-secure channels, among these, the most important are cryptography and steganography; the first one scrambles a message so that it cannot be understood, while the second intents to hide the existence of the message [2]. In general, a steganographic system consists of three elements: 1) cover object, which hides the secret object, 2) the secret object and 3) the stego object, which is the cover object with the secret object embedded inside it [3].…”