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
Highlights
The word Steganography is derived from Greek means “Hidden Writing” [1] and dates back to 440 B.C. [2]
Some earlier examples as reported in [3] include: shaving scalp of a most trusted slave to etch a secret message and waiting for the hair to grow after which he was sent to allies who retrieves it by reshaving his head; engraving messages on wooden Tablet and covering it wax
Steganography is an ancient art [5] that with technological revolution has been evolved into a science [6] to avert detection of hidden data. [7] delivered terminology for steganography while Simmon [8] gave the first model for steganography by discussing the scenario of Alice and Bob held in separate prison cells had to communicate through Warden Wendy
Summary
The word Steganography is derived from Greek means “Hidden Writing” [1] and dates back to 440 B.C. [2]. Some earlier examples as reported in [3] include: shaving scalp of a most trusted slave to etch a secret message and waiting for the hair to grow after which he was sent to allies who retrieves it by reshaving his head; engraving messages on wooden Tablet and covering it wax. The receiver retrieves it by melting the coated wax. Types of steganographic system are discussed in [9] as pure (with no Stego key), private key and public key respectively whereas three techniques for steganography including insertion, substitution and cover generation have been discussed in [10]
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