Chosen Ciphertext Secure Attribute-Based Encryption with Outsourced Decryption

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• 关键词：Attribute ; based encryption ; Chosen ciphertext security ; Outsourced decryption ; Random oracle model
• 刊名：Lecture Notes in Computer Science
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：9722
• 期：1
• 页码：495-508
• 全文大小：246 KB
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• 作者单位：Cong Zuo (15)
  Jun Shao (15)
  Guiyi Wei (15)
  Mande Xie (15)
  Min Ji (15)
  
  15. School of Computer and Information Engineering, Zhejiang Gongshang University, Hangzhou, 310018, People’s Republic of China
  
• 丛书名：Information Security and Privacy
• ISBN：978-3-319-40253-6
• 刊物类别：Computer Science
• 刊物主题：Artificial Intelligence and Robotics
  Computer Communication Networks
  Software Engineering
  Data Encryption
  Database Management
  Computation by Abstract Devices
  Algorithm Analysis and Problem Complexity
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1611-3349
• 卷排序：9722

文摘

Although attribute-based encryption (ABE) is a useful cryptographic tool to realize expressive access policy on ciphertexts, it is not quite suitable for mobile devices. The root cause lies in that the size of the ciphertext and the decryption cost are usually proportional to the complexity of the access policy. To solve this problem, a variant of ABE, named attribute-based encryption with outsourced decryption (OD-ABE), was proposed by Green, Hohenberger and Waters. Especially, OD-ABE allows a proxy with a transformation key delegated from the user to simplify ABE ciphertexts satisfied by the user’s attributes. On the other hand, this transformation also makes it tricky to design an OD-ABE scheme achieving the CCA security that is generally considered as the standard notion of security for a cryptosystem. However, the existing OD-ABE schemes only achieve the re-randomizable (replayable) CCA security. In this paper, we propose the CCA security model for OD-ABE and a concrete scheme secure in our proposed security model. We believe that this improvement on the security of OD-ABE will lead to a wider spectrum of applications.