A CP-WABE Scheme Supports Offline/Online Encryption and Verifiable Outsourced Decryption

LI Hang; FENG Chao-sheng; LIU Shuai-nan; LIU Bin; ZHAO Kai-qiang

doi:10.3969/j.issn.0372-2112.2020.11.008

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A CP-WABE Scheme Supports Offline/Online Encryption and Verifiable Outsourced Decryption

更新时间：2025-12-08

- A CP-WABE Scheme Supports Offline/Online Encryption and Verifiable Outsourced Decryption
- Acta Electronica Sinica Vol. 48, Issue 11, Pages: 2146-2153(2020)
- 作者机构：
  
  1. 四川师范大学计算机科学学院,四川,成都,610101
  2. 网络与数据安全四川省重点实验室, 电子科技大学,四川,成都,610054
  3. 四川师范大学计算机科学学院,四川,成都,610101
  4. 网络与数据安全四川省重点实验室电子科技大学,四川,成都,610054
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China (No.61373163);Project of Sichuan Province Key Laboratory of Network and Data Security (No.NDS2019-1);Key Laboratory of national defense science and Technology Foundation (No.6142103010709)
- DOI：10.3969/j.issn.0372-2112.2020.11.008
  CLC： TP309.2
- Published Online：25 November 2020，
  
  Published：2020
- 稿件说明：
移动端阅览
LI Hang, FENG Chao-sheng, LIU Shuai-nan, et al. A CP-WABE Scheme Supports Offline/Online Encryption and Verifiable Outsourced Decryption[J]. Acta Electronica Sinica, 2020, 48(11): 2146-2153.
DOI：

LI Hang, FENG Chao-sheng, LIU Shuai-nan, et al. A CP-WABE Scheme Supports Offline/Online Encryption and Verifiable Outsourced Decryption[J]. Acta Electronica Sinica, 2020, 48(11): 2146-2153. DOI： 10.3969/j.issn.0372-2112.2020.11.008.

摘要

已有的支持在线/离线加密和外包解密的基于属性加密的方案可实现细粒度访问控制和数据保密性，但无法实现同一属性之间的层次关系的表达和数据防篡改，并且终端需要在离线加密之前确定用户的访问结构，每次加密都需重新生成中间密文.针对上述问题，本文提出了一种支持离线/在线加密及可验证外包解密的CP-WABE（Ciphertext-Policy Weighted Attribute-Based Encryption）方案.该方案通过权重集合来实现同一属性层次关系的灵活表达，可实现一次离线加密就产生不同访问结构的数据的中间密文，在线仅需要少量开销就可完成加密，同时对外包解密的正确性进行了验证.最后对方案进行了安全性和性能分析，实验仿真也表明了本文对比相关方案更具优势.

Abstract

Existing attribute-based encryption schemes which support online/offline outsourcing encryption and decryption can realize fine-grained access control and data confidentiality

but it cannot achieve the expression of hierarchical relationships between the same attributes and prevent data from being tampered. Besides

the terminal needs to determine the user's access structure before offline encryption

and the intermediate ciphertext needs to be regenerated every time. Aiming at the above problems

this paper proposes a CP-WABE (Ciphertext-Policy Weighted Attribute-Based Encryption) scheme supports offline/online encryption and verifiable outsourced decryption. The scheme realizes the flexible expression of the hierarchical relation of the same attributes through the weight sets

which can realize the generation of intermediate ciphertext of the data with different access structure after one offline encryption

and complete the online encryption with only a small amount of overhead. At the same time

the correctness of outsourced decryption is verified. Finally

the security and performance of the scheme are analyzed

and the experimental simulation also shows that this paper has more advantages than the related schemes.

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