Digit al watermarking f or multimedia authent ication needs for authenticating digital media in this information era and the two main categories of authent ication techniques employed to meet these needs, namely labeling -based t echniques and watermarking-based techniques.Data integrity and source origin aut hentication are essential topics for real-timemultimedia systems. But the tradit ional met hods are not very applicable to overcome thedistortion introduced in multimedia data transport at ion. In this papersome securitymechanics are proposed, which rely on authent ication rather than on encryption methods.The highly asymmetric architectures found in ubiquitous computing applications areexploited to provide a protection of the transmitted multimedia data by means of well knowndigital watermarking techniques are int roduced to meet this need, a content-based image authent ication scheme that is suitable for an insecure network and robust to transmission errors. In proposed scheme, The Communication is achieved by relaying data along appropriate routes t hat are dynamically discovered and maintained through collaboration between the nodes. Discovery of such routes is a maj or task, both from efficiency and security points of view.
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