策略半隐藏且支持更新的多机构属性加密方案

doi:10.3969/j.issn.1001-2400.2018.02.021

Abstract

Abstract:

Attribute-Based Encryption (ABE) is a new cryptographic technique which guarantees fine-grained access control of outsourced encrypted data in the cloud. However, privacy revealing and policy updating are the key limitations. Thus, a Multi-Authority attribute-based encryption scheme with policy partially hidden and dynamic updating is proposed. In the scheme, the users' attribute is divided into two parts: the attribute name and the attribute value. The values of the user's attributes are hidden to prevent from revealing to any third parties. In addition, the Linear Secret-Sharing Scheme(LSSS) access structure and policy updating algorithms can support any type of policy updating, and it proves secure against the chosen plaintext attack in the standard model. Compared to the existing related schemes, the size of both users' secret key and ciphertext is reduced, and the lower computing cost makes it more effective in protecting users' attributes and support policy updates.

Key words: attribute based encryption, multi-authority, policy semi-hidden, policy updating

YAN Xixi;LIU Yuan;LI Zichen;TANG Yongli. Multi-authority attribute-based encryption scheme with policy semi-hidden and dynamic updating[J].Journal of Xidian University, 2018, 45(2): 122-128+147.

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Multi-authority attribute-based encryption scheme with policy semi-hidden and dynamic updating

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