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篇名 |
Constant Ciphertext Size Multi-Authority Attribute-based Scheme Without Key Escrow
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並列篇名 | Constant Ciphertext Size Multi-Authority Attribute-based Scheme Without Key Escrow |
作者 | Shengzhou Hu、Jiguo Li、Yang Lu、Yichen Zhang |
英文摘要 | With the development of cloud computing application, attribute based encryption (ABE) with flexibly finegrained data access control is adopted widely. However, the honest but curious authorities often peep at the user data. How to eliminate the key escrow is also an important and challenging problem in ABE schemes. In this paper, a constant ciphertext size multi-authority ciphertext-policy ABE scheme (RKE-MA-ABE) which resists key escrow is presented. In the proposed scheme, a user credential issuer (UCI ) is introduced to generate a credential for each user credibly. UCI decentralizes the managing privilege of attribute authorities ( AAs ) and helps to embed the user’s secret value into the decryption key issued by the corresponding AAs . Additionally, AAs in this scheme work independently without interacting with each other to generate the master public key of the system during the system initialization phase. Our scheme avoids the collusion attacks by vicious users or authorities and has constant ciphertext length. It is proven CPA-secure under the decisional q-Bilinear Diffie-Hellman Exponent (q-BDHE) assumption in random oracle model. |
起訖頁 | 1647-1657 |
關鍵詞 | Attribute-based encryption、Key escrow、Multi-authority、Constant ciphertext size |
刊名 | 網際網路技術學刊 |
期數 | 202011 (21:6期) |
出版單位 | 台灣學術網路管理委員會 |
DOI |
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