| 支持访问更新的可验证外包属性加密方案 |
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| 作者姓名： | 林素青 |
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| 作者单位： | 天津财经大学理工学院，天津 300222 |
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| 基金项目： | 天津市教委科研计划项目“支持动态策略更新的可搜索属性加密技术研究”(2017KJ237) |
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| 摘 要： | 为满足公共云存储加密数据安全可靠的访问需求，提出支持访问更新的可验证外包属性加密方案。以经典的KP-ABE方案为基础，通过巧妙的算法设计实现方案的外包解密和密文访问权限可更新功能，同时支持外包计算的可验证性，确保第三方服务器诚实可靠地执行算法过程。在标准模型下证明方案关于原始密文和更新密文均具有选择 IND-CPA 安全性，并具备弱主私钥安全性和外包计算的验证可靠性。与同类方案相比，实现了功能、安全性和效率的协同优化。
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| 关 键 词： | 属性加密 外包解密 访问更新 验证可靠性 |
Verifiable outsourced attribute-based encryption with access update |
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| Authors: | Suqing LIN |
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| Affiliation: | Institute of Science and Technology,Tianjin University of Finance and Economics,Tianjin 300222,China |
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| Abstract: | In order to meet the secure and reliable access requirements for the encrypted data stored in the public cloud,a verifiable outsourced attribute-based encryption scheme with access update was proposed.Based on a standard KP-ABE scheme,verifiable outsourced decryption and verifiable access update for a ciphertext through novel constructions for the scheme were obtained.The verifiability of the outsourced computation ensures that the third-party service may perform algorithms honestly.The scheme has selective IND-CPA security for the original and updated ciphertexts,weak master private key security,and verification soundness in the standard model were proved,respectively.Compared with similar schemes from literatures,the proposed scheme can achieve tradeoff in the optimization of functionality,security and efficiency. |
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| Keywords: | attribute-based encryption outsourced decryption access update verification soundness |
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