Multi-authority attribute-based encryption scheme with policy dynamic updating |
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Authors: | Xi-xi YAN Yuan LIU Zi-chen LI Yong-li TANG |
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Affiliation: | 1. College of Computer Science and Technology,Henan Polytechnic University,Jiaozuo 454003,China;2. College of Information Engineering,Beijing Institute of Graphic Communication,Beijing 102600,China |
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Abstract: | Attribute-based encryption (ABE) is a new cryptographic technique which guarantees fine-grained access control of outsourced encrypted data in the cloud environment.However,a key limitation remains,namely policy updating.Thus,a multi-authority attribute-based encryption scheme with policy dynamic updating was proposed.In the scheme,an anonymous key issuing protocol was introduced to protect users’ privacy and resist collusion attack of attribute authority.The scheme with dynamic policy updating technique was secure against chosen plaintext attack under the standard model and can support any types of policy updating.Compared to the existing related schemes,the size of ciphertext and users’ secret key is reduced and can significantly reduce the computation and communication costs of updating ciphertext.It is more effective in the practical application. |
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Keywords: | attribute based encryption multi-authority dynamic policy updating privacy protection |
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