Steganography is an important area of research in recent years involving a number of applications. It is the science of embedding information into the cover image viz., text, video, and image (payload) without causing statistically significant modification to the cover image. The modern secure image steganography presents a challenging task of transferring the embedded information to the destination without being detected. In this paper we present an image based steganography that combines Discrete Cosine Transform (DCT), and compression techniques with LSB techniques on raw images to enhance the security of the payload. Initially the cover-image is transformed from spatial domain to the frequency domain using DCT. The image is then quantized. and LSB technique is used to insert in pixels specified according to a range.
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[v1] 2012-08-19 01:53:22
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