Abstract

Many web-based services involve distribution of content like digital audio, video, software, games, stock quotes, streaming presentations, and live news feeds through distributed networking technologies, like content distribution networks (CDN’s), multicast networks, and peer-to-peer networks. Unfortunately, these modern distributed systems, designed to distribute content to a large group of users, also provide a platform for adversarial users to launch a myriad attacks with widespread consequences. Adversaries can masquerade as legitimate content providers to distribute malicious content possibly infected with worms, viruses, etc. Authenticating the content plays a crucial role in preventing these attacks. The task of protecting content is the responsibility of content providers. Today majority of mass-viewed content is dynamically generated and rich in multimedia that include combination of text, audio, still images, animation, video, and interactive content forms that are gathered from a myriad of sources, assembled and presented to the user. In such scenarios, malicious modification of content by malicious sources becomes a legitimate threat.

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