[ACM Press the eleventh ACM symposium -
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Chakraborty, Sudip; Ray, Indrajit
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Article
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2006
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ACM Press
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English
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Conventional access control models like role based access control are suitable for regulating access to resources by known users. However, these models have often found to be inadequate for open and decentralized multi-centric systems where the user population is dynamic and the identity of all user