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The access control of encrypted documents can be well realized by using attribute-based encryption schemes. But the attributes are static in all attribute-based encryption schemes, resulting in certain problems in practical applications. Based on conditions-based encryption, a dynamic attributebased encryption scheme is developed. The scheme allows one user to calculate his own attributes key in the scheme once he satisfies a certain attribute after the authenticating party＇s digital signature is given. The security of the scheme is discussed at last. [ABSTRACT FROM AUTHOR]