The Research Of Multi-authority Attribute-based Signatures And Encryotions Algorithm

Attribute-based cryptographic system (ABCS) has attracted more and more attentions, eachuser of the system can be described by a set of properties that the user has a set of attributescorresponding to the key set, user authentication do not need certificate. Attribute-basedcryptographic system with a single authority can not meet the actual applications, it takes a amountsof calculation to the single authority led to the lower computational efficiency. The systems ofMA-ABC allow multiple independent authority manage their own attribute alone, reduce the workpressure of the single authority, and reduce the dependence on the single authority.In this paper, some higher efficiency schemes of MA-ABC have proposed. Firstly the paperpresents new type of MA-ABS, the signed file verification has been validated by a number ofattributes that only reach a certain threshold, the scheme meet unforgeable under adaptive chosenmessage attack. Secondly the paper presents the ABS which can be applied in distributed systems,each attribute authority is independent, manage their own attributes and assign the correspondingprivate keys, but the central authority does not monitor the attribute authority. Finally the paperproposes a Multi-Central-Authority attribute based encryption system(MCA-ABE) which can beused in large-scale network environment, slowing the single CA work pressure, and reducedependence on the single CA, the system can satisfy the security only need one reliable CA.