The cloud storage service cannot be completely trusted because of the separation of data management and ownership, leading to the difficulty of data privacy protection. In order to protect the privacy of data on untru...The cloud storage service cannot be completely trusted because of the separation of data management and ownership, leading to the difficulty of data privacy protection. In order to protect the privacy of data on untrusted servers of cloud storage, a novel multi-authority access control scheme without a trustworthy central authority has been proposed based on CP-ABE for cloud storage systems, called non-centered multi-authority proxy re-encryption based on the cipher-text policy attribute-based encryption(NC-MACPABE). NC-MACPABE optimizes the weighted access structure(WAS) allowing different levels of operation on the same file in cloud storage system. The concept of identity dyeing is introduced to improve the users' information privacy further. The re-encryption algorithm is improved in the scheme so that the data owner can revoke user's access right in a more flexible way. The scheme is proved to be secure. And the experimental results also show that removing the central authority can resolve the existing performance bottleneck in the multi-authority architecture with a central authority, which significantly improves user experience when a large number of users apply for accesses to the cloud storage system at the same time.展开更多
This paper theoretically analyzes a deficiency of the existing scheme, and proposes a distributed multi-hop certification authority scheme for mobile Ad Hoc networks. In our design, we distribute the certification aut...This paper theoretically analyzes a deficiency of the existing scheme, and proposes a distributed multi-hop certification authority scheme for mobile Ad Hoc networks. In our design, we distribute the certification authority functions through a threshold secret sharing mechanism, in which each node holds a secret share and multiple nodes jointly provide complete services. Certification authority is not limited in a local neighborhood but can be completed within multi-hop location. In addition, we replace broadcast by multicast to improve system performance and reduce communication overhead. This paper resolves some technical problems of ubiquitous certification authority services, and presents a wieldy multi-hop certification authority algorithm. Simulation results confirm the availability and effectiveness of our design.展开更多
When developing and integrating a new environmental legal system under the Environmental Code,the joint regulation of ecology and environment,natural resources and an energy beyond the sphere of mere environmental con...When developing and integrating a new environmental legal system under the Environmental Code,the joint regulation of ecology and environment,natural resources and an energy beyond the sphere of mere environmental concerns can be achieved;the semantic expression of environmental regulation can be expounded.Additionally,through the codification of environmental law,a revolutionary path for the structure of authority can be found.Environmental codification dictates a method for clarification of the boundaries and relations of environmental management authority.Under the theory of Holistic Governance and in the codification process,the reform of environmental regulation authority should be concluded from both vertical and horizontal dimensions,through organizing,integrating,separating,classifying and finally,by establishing a synergy between the central and local governments and their departments.This can break down structural barriers to communication and cooperation of the ecological regulation and resource management authority and help establish uniformity of environmental regulation.展开更多
The dissociation between data management and data ownership makes it difficult to protect data security and privacy in cloud storage systems.Traditional encryption technologies are not suitable for data protection in ...The dissociation between data management and data ownership makes it difficult to protect data security and privacy in cloud storage systems.Traditional encryption technologies are not suitable for data protection in cloud storage systems.A novel multi-authority proxy re-encryption mechanism based on ciphertext-policy attribute-based encryption（MPRE-CPABE） is proposed for cloud storage systems.MPRE-CPABE requires data owner to split each file into two blocks,one big block and one small block.The small block is used to encrypt the big one as the private key,and then the encrypted big block will be uploaded to the cloud storage system.Even if the uploaded big block of file is stolen,illegal users cannot get the complete information of the file easily.Ciphertext-policy attribute-based encryption（CPABE）is always criticized for its heavy overload and insecure issues when distributing keys or revoking user＇s access right.MPRE-CPABE applies CPABE to the multi-authority cloud storage system,and solves the above issues.The weighted access structure（WAS） is proposed to support a variety of fine-grained threshold access control policy in multi-authority environments,and reduce the computational cost of key distribution.Meanwhile,MPRE-CPABE uses proxy re-encryption to reduce the computational cost of access revocation.Experiments are implemented on platforms of Ubuntu and CloudSim.Experimental results show that MPRE-CPABE can greatly reduce the computational cost of the generation of key components and the revocation of user＇s access right.MPRE-CPABE is also proved secure under the security model of decisional bilinear Diffie-Hellman（DBDH）.展开更多
Aimed at the needs of developing the CAI courseware with popularization, the expression ways for hypercard based information, and the key principles of the development for authoring tools, were discussed. The ideas of...Aimed at the needs of developing the CAI courseware with popularization, the expression ways for hypercard based information, and the key principles of the development for authoring tools, were discussed. The ideas of the revised hypermedia chaining structure were introduced. The framework of the courseware authoring tool, its function design and the methods of technical realization for system software were also involved.展开更多
1.Journal of Yunnan Agricultural University is spon-sored by Yunnan Agricultural University and has been published since1986.The journal was initially pub-lished semi-annually,and changed to quarterly in1989and bimont...1.Journal of Yunnan Agricultural University is spon-sored by Yunnan Agricultural University and has been published since1986.The journal was initially pub-lished semi-annually,and changed to quarterly in1989and bimonthly in2004.As a comprehensive sci-entific periodical publication in China and abroad,Journal of Yunnan Agricultural University won the ti-tles of Chinese core journals,the core of Chinais sci-ence and technology journals,the core of Chinai ag-ricultural science journals.展开更多
Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest developments and achievements in both theoretical and pra...Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest developments and achievements in both theoretical and practical aspects of systems engineering,electronics and related research areas.The journal welcomes high quality original papers from a wide range of countries.The scope of the journal includes systems engineering,military systems,electronic technology,defense electronic technology,control theory and practice,software algorithm and simulation,reliability,computer development and application,and other topics in all related fields.展开更多
Journal of Systems Engineering and Electronics,keeping abreast with the development trend of scienceand technology worldwide, reports the latest developmentsand achievements in both theoretical andpractical aspects of...Journal of Systems Engineering and Electronics,keeping abreast with the development trend of scienceand technology worldwide, reports the latest developmentsand achievements in both theoretical andpractical aspects of systems engineering, electronicsand related research areas. The journal welcomes highquality original papers from a wide range of countries.The scope of the journal includes systems engineering,military systems, electronic technology, defense electronictechnology, control theory and practice, softwarealgorithm and simulation, reliability, computerdevelopment and application, and other topics in allrelated fields.展开更多
Aims and scope Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest develop- ments and achievements in both theoretical and...Aims and scope Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest develop- ments and achievements in both theoretical and practical aspects of systems engineering, electronics and related research areas. The journal welcomes high quality original papers from a wide range of countries. The scope of the journal includes systems engineering, military systems, electronic technology, defense elec- tronic technology, control theory and practice, soft- ware algorithm and simulation, reliability, computer development and application, and other topics in all related fields.展开更多
Contributions falling into the following categories will be considered for publication: Original research papers, reviews, note. Please ensure that you select the appropriate article type from the list of options when...Contributions falling into the following categories will be considered for publication: Original research papers, reviews, note. Please ensure that you select the appropriate article type from the list of options when making your submission. Authors contributing to special issues should ensure that they select the special issue article type from this list.展开更多
Aims and scope Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest developments and achievements in both theoretical and p...Aims and scope Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest developments and achievements in both theoretical and practical aspeets of systems engineering, electronics and related research areas. The journal welcomes high quality original papers from a wide range of countries.展开更多
Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest develop- ments and achievements in both theoretical and practical aspe...Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest develop- ments and achievements in both theoretical and practical aspects of systems engineering, electronics and related research areas. The journal welcomes high quality original papers from a wide range of countries. The scope of the journal includes systems engineering, military systems, electronic technology, defense elec- tronic technology, control theory and practice, soft- ware algorithm and simulation, reliability, computer development and application, and other topics in all related fields.展开更多
基金Projects(61472192,61202004)supported by the National Natural Science Foundation of ChinaProject(14KJB520014)supported by the Natural Science Fund of Higher Education of Jiangsu Province,China
文摘The cloud storage service cannot be completely trusted because of the separation of data management and ownership, leading to the difficulty of data privacy protection. In order to protect the privacy of data on untrusted servers of cloud storage, a novel multi-authority access control scheme without a trustworthy central authority has been proposed based on CP-ABE for cloud storage systems, called non-centered multi-authority proxy re-encryption based on the cipher-text policy attribute-based encryption(NC-MACPABE). NC-MACPABE optimizes the weighted access structure(WAS) allowing different levels of operation on the same file in cloud storage system. The concept of identity dyeing is introduced to improve the users' information privacy further. The re-encryption algorithm is improved in the scheme so that the data owner can revoke user's access right in a more flexible way. The scheme is proved to be secure. And the experimental results also show that removing the central authority can resolve the existing performance bottleneck in the multi-authority architecture with a central authority, which significantly improves user experience when a large number of users apply for accesses to the cloud storage system at the same time.
文摘This paper theoretically analyzes a deficiency of the existing scheme, and proposes a distributed multi-hop certification authority scheme for mobile Ad Hoc networks. In our design, we distribute the certification authority functions through a threshold secret sharing mechanism, in which each node holds a secret share and multiple nodes jointly provide complete services. Certification authority is not limited in a local neighborhood but can be completed within multi-hop location. In addition, we replace broadcast by multicast to improve system performance and reduce communication overhead. This paper resolves some technical problems of ubiquitous certification authority services, and presents a wieldy multi-hop certification authority algorithm. Simulation results confirm the availability and effectiveness of our design.
文摘When developing and integrating a new environmental legal system under the Environmental Code,the joint regulation of ecology and environment,natural resources and an energy beyond the sphere of mere environmental concerns can be achieved;the semantic expression of environmental regulation can be expounded.Additionally,through the codification of environmental law,a revolutionary path for the structure of authority can be found.Environmental codification dictates a method for clarification of the boundaries and relations of environmental management authority.Under the theory of Holistic Governance and in the codification process,the reform of environmental regulation authority should be concluded from both vertical and horizontal dimensions,through organizing,integrating,separating,classifying and finally,by establishing a synergy between the central and local governments and their departments.This can break down structural barriers to communication and cooperation of the ecological regulation and resource management authority and help establish uniformity of environmental regulation.
基金supported by the National Natural Science Foundation of China(6120200461472192)+1 种基金the Special Fund for Fast Sharing of Science Paper in Net Era by CSTD(2013116)the Natural Science Fund of Higher Education of Jiangsu Province(14KJB520014)
文摘The dissociation between data management and data ownership makes it difficult to protect data security and privacy in cloud storage systems.Traditional encryption technologies are not suitable for data protection in cloud storage systems.A novel multi-authority proxy re-encryption mechanism based on ciphertext-policy attribute-based encryption（MPRE-CPABE） is proposed for cloud storage systems.MPRE-CPABE requires data owner to split each file into two blocks,one big block and one small block.The small block is used to encrypt the big one as the private key,and then the encrypted big block will be uploaded to the cloud storage system.Even if the uploaded big block of file is stolen,illegal users cannot get the complete information of the file easily.Ciphertext-policy attribute-based encryption（CPABE）is always criticized for its heavy overload and insecure issues when distributing keys or revoking user＇s access right.MPRE-CPABE applies CPABE to the multi-authority cloud storage system,and solves the above issues.The weighted access structure（WAS） is proposed to support a variety of fine-grained threshold access control policy in multi-authority environments,and reduce the computational cost of key distribution.Meanwhile,MPRE-CPABE uses proxy re-encryption to reduce the computational cost of access revocation.Experiments are implemented on platforms of Ubuntu and CloudSim.Experimental results show that MPRE-CPABE can greatly reduce the computational cost of the generation of key components and the revocation of user＇s access right.MPRE-CPABE is also proved secure under the security model of decisional bilinear Diffie-Hellman（DBDH）.
文摘Aimed at the needs of developing the CAI courseware with popularization, the expression ways for hypercard based information, and the key principles of the development for authoring tools, were discussed. The ideas of the revised hypermedia chaining structure were introduced. The framework of the courseware authoring tool, its function design and the methods of technical realization for system software were also involved.
文摘1.Journal of Yunnan Agricultural University is spon-sored by Yunnan Agricultural University and has been published since1986.The journal was initially pub-lished semi-annually,and changed to quarterly in1989and bimonthly in2004.As a comprehensive sci-entific periodical publication in China and abroad,Journal of Yunnan Agricultural University won the ti-tles of Chinese core journals,the core of Chinais sci-ence and technology journals,the core of Chinai ag-ricultural science journals.
文摘Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest developments and achievements in both theoretical and practical aspects of systems engineering,electronics and related research areas.The journal welcomes high quality original papers from a wide range of countries.The scope of the journal includes systems engineering,military systems,electronic technology,defense electronic technology,control theory and practice,software algorithm and simulation,reliability,computer development and application,and other topics in all related fields.
文摘Journal of Systems Engineering and Electronics,keeping abreast with the development trend of scienceand technology worldwide, reports the latest developmentsand achievements in both theoretical andpractical aspects of systems engineering, electronicsand related research areas. The journal welcomes highquality original papers from a wide range of countries.The scope of the journal includes systems engineering,military systems, electronic technology, defense electronictechnology, control theory and practice, softwarealgorithm and simulation, reliability, computerdevelopment and application, and other topics in allrelated fields.
文摘Aims and scope Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest develop- ments and achievements in both theoretical and practical aspects of systems engineering, electronics and related research areas. The journal welcomes high quality original papers from a wide range of countries. The scope of the journal includes systems engineering, military systems, electronic technology, defense elec- tronic technology, control theory and practice, soft- ware algorithm and simulation, reliability, computer development and application, and other topics in all related fields.
文摘Contributions falling into the following categories will be considered for publication: Original research papers, reviews, note. Please ensure that you select the appropriate article type from the list of options when making your submission. Authors contributing to special issues should ensure that they select the special issue article type from this list.
文摘Aims and scope Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest developments and achievements in both theoretical and practical aspeets of systems engineering, electronics and related research areas. The journal welcomes high quality original papers from a wide range of countries.
文摘Journal of Systems Engineering and Electronics, keeping abreast with the development trend of science and technology worldwide, reports the latest develop- ments and achievements in both theoretical and practical aspects of systems engineering, electronics and related research areas. The journal welcomes high quality original papers from a wide range of countries. The scope of the journal includes systems engineering, military systems, electronic technology, defense elec- tronic technology, control theory and practice, soft- ware algorithm and simulation, reliability, computer development and application, and other topics in all related fields.
