支持策略动态更新的多机构属性基加密方案

doi:10.11959/j.issn.1000-436x.2017201

Abstract

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.

Key words: attribute based encryption, multi-authority, dynamic policy updating, privacy protection

CLC Number:

TP309

Xi-xi YAN,Yuan LIU,Zi-chen LI,Yong-li TANG. Multi-authority attribute-based encryption scheme with policy dynamic updating[J]. Journal on Communications, 2017, 38(10): 94-101.

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References 12

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方案	功能		安全性		通信代价
	多机构	动态策略更新	群阶	安全模型	用户私钥大小	密文大小	动态更新密钥大小
	多机构	动态策略更新	群阶	安全模型	用户私钥大小	密文大小	类型1	类型2	类型3
文献[3]方案	√	×	素数	Standard	S+ 6	(2l+3)I_c+1	—	—	—
文献[6]方案	√	√	合数	Generic Group	S	3l+1	2l₁′	3l₂′	3l₃′
文献[7]方案	×	√	合数	Standard	S+ 2	2(2l+2)	5l₁′	6l₂′	4l₃′
文献[11]方案	√	√	合数	Standard	S+D(N+2)	2l+2	l₁′	2l₂′	2l₃′
本文方案	√	√	素数	Standard	2S+1	2l+2	l₁′	2l₂′	2l₃′

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Multi-authority attribute-based encryption scheme with policy dynamic updating

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