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Due to the explosive growth of the Internet and the pervasion of multimedia, protection of Intellectual Property (IP) rights of digital content in transactions induces people's concerns. Current security requirements and copyright protection mechanisms especially need to work in real-time and on-line for communication and networking. For media service systems in the Internet, user's authentication is most essential in association with the access control of the media system. The authentication scheme is a trivial but crucial issue for maintaining user's information. Up to now, many one-time password-based authentication schemes have been proposed. However, none is secure enough.
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