摘要： 现有大部分属性加密方案中的用户属性都是静态的，不利于实际应用。针对该问题，基于条件加密的思想，利用双线性映射的技术，设计一个基于动态属性的加密方案。在用户满足某属性后，由认证方给用户提供数字签名，并让用户自行计算其属性密钥和密文。对该方案的安全性进行讨论，证明在选择集合模型下给定2个等长明文的加密，方案攻击者无法在计算上分清其密文。

关键词: 密文策略, 属性加密, 条件加密, 动态, 双线性对, 线性秘密共享方案

Abstract: In practical applications, most attribute-based encryption schemes have problems due to the static of attributes. To overcome this problem, this paper develops a dynamic ciphertext-policy attribute-based encryption scheme based on bilinear pairings, and the scheme is related to the conditions-based encryption. In the scheme, user is allowed to calculate its own attribute key and ciphertexts once it satisfies certain attribute after the authenticating party’s digital signature is given. The security of the scheme is discussed at last, and it shows that the ciphertexts are computational distinguish when given two encryptions of plaintext with same length.

Key words: ciphertext-policy, attribute encryption, condition encryption, dynamic, bilinear pairings, Linear Secret-Sharing Schemes (LSSS)

中图分类号: 

• TP309.7