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loginWith the development of computing technologies, digital media securitybecomes aneverincreasing issue of daily life. As computer software and hardware evolves and as moreof it becomes accessible as an Internetapplication or service, information security hasgone from initially protecting digital images, into the area of multimedia. This area ofmultimedia includes computer graphics, images, digital video and digital audio. As theInternet expands, so does the significance of multimedia security. This chapter will coversome of the basic knowledge required and what should be considered when discussing mediasecurity. Analysis of the theoretical background of these issues is given, which is used toguide the practical applications.