| Summary: | 碩士 === 國立臺北大學 === 資訊工程學系 === 100 === In the first part of this thesis,we proposed an RSA-based broadcast encryption scheme.In this scheme we can solve the problem on traitor tracing.Under some conditions we can identify each traitor.Furthermore,without updating whole system,we can revoke at most k users conveniently.
In the second part of this thesis,we proposed a modified attribute-based encryption scheme.Based on the scheme of Sahai and Waters ,we encrypt the attribute which can be eavesdropped in the original scheme of Sahai and Waters by using broadcast encryption.As a result, our scheme gets better privacy than the one of Sahai and Waters.
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