网络与信息安全学报 ›› 2016, Vol. 2 ›› Issue (5): 39-49.doi: 10.11959/j.issn.2096-109x.2016.00055

• 学术论文 • 上一篇    下一篇

支持策略更新的外包属性加密

林素青1,2   

  1. 1 中国科学院信息工程研究所信息安全国家重点实验室,北京 100093
    2 中国科学院大学,北京100049
  • 修回日期:2016-05-08 出版日期:2016-05-15 发布日期:2020-03-26
  • 作者简介:林素青(1982-),女,浙江温州人,中国科学院信息工程研究所博士生,主要研究方向为信息安全、密码学。
  • 基金资助:
    国家自然科学基金资助项目(61379142)

Outsourced attribute-based encryption with policy update

Su-qing LIN1,2   

  1. 1 The State Key Lab of Information Security,Institute of Information Engineering,Chinese Academy of Sciences,Beijing 100093,China
    2 University of Chinese Academy of Sciences,Beijing 100049,China
  • Revised:2016-05-08 Online:2016-05-15 Published:2020-03-26
  • Supported by:
    The National Natural Science Foundation of China(61379142)

摘要:

摘 要:为满足云存储密态数据高效灵活的访问需求,提出支持策略更新的外包属性加密方案。以经典的属性加密方案为基础模块,采用类密钥盲化方法和外包解密技术,在确保明文数据和用户私钥不泄露的条件下,实现密文访问策略的代理更新,同时切实有效地降低终端用户的解密计算量。方案支持非单调的访问结构,在标准模型和假设下可证明具有选择 IND-CPA 安全性和私钥安全性,与文献同类方案相比,实现了安全性和终端访问效率的进一步优化。

关键词: 属性加密, 外包解密, 策略更新, 私钥安全性

Abstract:

In order to achieve the efficient and flexible access control for the encrypted data stored in the cloud,an outsourced attribute-based encryption scheme with policy update was proposed.Based on the standard attribute-based encryption scheme,the functionality of policy update from delegation for a ciphertext without revealing any confidential information of the plaintext and private keys by utilizing the techniques of key blinding and outsourcing decryption was accomplished.Simultaneously,the decryption overhead for a user to recover the plaintext was effectively reduced.The scheme supports non-monotonic access structure and can be proved to have selective IND-CPA security and private key security under standard assumptions,respectively,in the standard model.Compared with similar schemes from literatures,the scheme provides better security and efficiency.

Key words: attribute-based encryption, outsourced decryption, policy update, private key security

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