A. Khamrui

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This study deals with devising and implementing a novel technique for image authentication and secured message transmission based on hiding large volume of data into gray scale images. Image authentication is done by embedding message / image in spatial domain by choosing image blocks of size 3 × 3 from the source image in row major order. Three bits(More)
Image authentication is done by embedding image/ message in spatial domain or frequency domain. A mask is chosen from the source image in row major order. Bits of the authenticating image are embedded in each byte of the source image block where the position is chosen using hash function. A hash function is a function that takes variable size inputs and(More)
With the rapid growing of the internet technology it has been observed that the use of digital image has become the essential part in many applications. The digital image is used in various field like medical, defense, historical applications etc. While transmitting the image on internet which is such an unsafe communication medium because of the number of(More)
In this paper Genetic Algorithm based image authentication technique in frequency domain using Z transformation (IAFDGA) has been proposed. A 2×2 mask is taken from the source image in row major order. Z transformation is applied to transform it into frequency domain. Six bits are embedded in each sub mask into the second and third transformed coefficients.(More)
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