Stenography Using Palette Images

Information security has recently become important in a number of application areas. Digital audio, video and pictures are increasingly furnished with distinguishing but imperceptible marks. Palette images are widely used in multimedia and Internet applications. In this project, a new method for data hiding in palette images with security protection by color ordering and mapping is suggested. First, image pixels are classified as data embeddable or non embeddable, and only the former ones are used to embed secret data. The proposed idea of data hiding is based on the use of a new type of color-ordering relationship, from which a color-mapping function is defined with binary values as output. When a secret data bit is to embed, a data embeddable pixel is selected; its color is adjusted to make the output of color-mapping function equal to the secret bit value. The embedded secret data can be extracted correctly and quickly from the resulting stegoimage by merely inspecting the outputs of the color-mapping function This paper contains modified algorithm [1] in which parameters are randomized. It contains introduction, background, implementation, testing and result analysis, conclusion and future enhancement.