Improving Security and Sharing in Online Social Efficiency for Encrypted Data Networks

查看全文 作　　者：HUANG [1,2]Qinlong MA [1,2]Zhaofeng YANG [1,2]Yixian NIU [1,2]Xinxin FU [1,2]Jingyi

机构地区：[1]Information Security Center, Beijing University of Posts and Telecommunications, Beijing 100876, China;[2]National Engineering Laboratory for Disaster Backup and Recovery, Beijing University of Posts and Telecommunications, Beijing 100876,China

出　　处：《China Communications》索引2014年第11卷第3期,共14页

基　　金：This work has been supported by the National Natural Science Foundation of China under Grant No.61272519,the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20120005110017,and the National Key Technology R&D Program under Grant No.2012BAH06B02 摘　　要：Despite that existing data sharing systems in online social networks(OSNs)propose to encrypt data before sharing,the multiparty access control of encrypted data has become a challenging issue.In this paper,we propose a secure data sharing scheme in OSNs based on ciphertext-policy attributebased proxy re-encryption and secret sharing.In order to protect users' sensitive data,our scheme allows users to customize access policies of their data and then outsource encrypted data to the OSNs service provider.Our scheme presents a multiparty access control model,which enables the disseminator to update the access policy of ciphertext if their attributes satisfy the existing access policy.Further,we present a partial decryption construction in which the computation overhead of user is largely reduced by delegating most of the decryption operations to the OSNs service provider.We also provide checkability on the results returned from the OSNs service provider to guarantee the correctness of partial decrypted ciphertext.Moreover,our scheme presents an efficient attribute revocation method that achieves both forward and backward secrecy.The security and performance analysis results indicate that the proposed scheme is secure and efficient in OSNs. 关键词：加密数据数据网络共享数据安全性在线数据共享系统服务提供商社会

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Improving Security and Sharing in Online Social Efficiency for Encrypted Data Networks

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