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Preliminary proposal of scientific data verification in CSES mission

Earthquake Science 2015年第4期28卷 303-310页

作者： Lan-wei Wang Xu-hui Shen Yu Zhang Rui Yan Institute of Crustal Dynamics China Earthquake Administration Beijing Engineering Research Center of Earthquake Observation

China Seismo-Electromagnetic Satellite （CSES） will be launched at the end of 2016 and the orbit is sun- synchronous and the altitude is about 500 km. The design of CSES satellite and ground segment are introduced in this paper first. And then the preliminary proposals of scientific data verification and cross-verification in CSES mission are given, which can be used to classify the payloads＇ operation state, and validate the reliability of data.

关键词： CSES mission data verification Inter-calibration

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Flexible CP-ABE Based Access Control on Encrypted data for Mobile Users in Hybrid Cloud System

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Journal of Computer Science & Technology 2017年第5期32卷 974-990页

作者： Wen-Min Li Xue-Lei Li Qiao-Yan Wen Shuo Zhang Hua Zhang State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

In hybrid cloud computing, encrypted data access control can provide a fine-grained access method for organizations to enact policies closer to organizational policies. This paper presents an improved CP-ABE (ciphertext-policy attribute-based encryption) scheme to construct an encrypted data access control solution that is suitable for mobile users in hybrid cloud system. In our improvement, we split the original decryption keys into a control key, a secret key and a set of transformation keys. The private cloud managed by the organization administrator takes charge of updating the transformation keys using the control key. It helps to handle the situation of flexible access management and attribute alteration. Meanwhile, the mobile user's single secret key remains unchanged as well as the ciphertext even if the data user's attribute has been revoked. In addition, we modify the access control list through adding the attributes with corresponding control key and transformation keys so as to manage user privileges depending upon the system version. Finally, the analysis shows that our scheme is secure, flexible and efficient to be applied in mobile hybrid cloud computing.

关键词： attribute-based access control hybrid cloud outsourcing computing attribute alteration data verification

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A privacy-preserved indexing schema in DaaS model for range queries

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High Technology Letters 2020年第4期26卷 448-454页

作者： Hao Renzhi Li Jun Wu Guangjun College of Control Science and Engineering Zhejiang UniversityHangzhou 310058P.R.China School of Cyber Security University of Chinese Academy of SciencesBeijing 100093P.R.China Institute of Information Engineering Chinese Academy of SciencesBeijing 100093P.R.China

In a database-as-a-service(DaaS)model,a data owner stores data in a database server of a service provider,and the DaaS adopts the encryption for data privacy and indexing for data ***,an attacker can obtain original data’s statistical information and distribution via the indexing distribution from the database of the service *** this work,a novel indexing schema is proposed to satisfy privacy-preserved data management requirements,in which an attacker cannot obtain data source distribution or statistic information from the *** approach includes 2 parts:the Hash-based indexing for encrypted data and correctness verification for range *** evaluation results demonstrate that the approach can hide statistical information of encrypted data distribution while can also obtain correct answers for range ***,the approach can achieve nearly 10 times and 35 times improvement on encrypted data publishing and indexing respectively,compared with the start-of-the-art method order-preserving Hash-based function(OPHF).

关键词： database-as-a-service(DaaS)model data privacy and security data verification range query

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