基于可撤销外包属性加密的二维码加密

doi:10.11896/jsjkx.181102187

摘要/Abstract

摘要： 二维码技术应用广泛,性能优越,但传统的二维码技术的安全性较低,仅适合单一权限对单一信息的扫码获取,不能实现不同权限用户扫码获取不同信息的功能。密文策略属性加密(CP-ABE)作为一种细粒度的数据加密方式,可在保证数据安全的同时实现对用户的访问控制,实现一对多模式的信息传输获取。结合二维码和密文策略属性加密技术的特点和优点,提出一种基于可撤销外包属性加密的二维码加密方案,对基于权限划分的信息块进行二次加密后外包给服务器进行相应的解密和权限匹配,再把初次解密的密文返回给用户,用户通过扫码获得私钥后进行二次解密得到明文,二维码的生成可随随机密钥的不同而变化。通过方案的安全性分析,证明了该方案具有前向安全、后向安全和在双线性q-BDHE假设下的选择明文攻击安全(IND-CPA);通过设计的实验,验证了方案在保障二维码信息安全的同时,可实现二维码的一对多的信息有选择获取,具有用户端计算开销低、属性可撤销、二维码生成随机的优点。

关键词: 二维码, 可撤销, 外包, 属性加密

Abstract: The two-dimensional code technology has a wide range of applications and superior performance,but the traditional two-dimensional code technology has low security and is only suitable for single-privilege scanning of a single information,and cannot implement different functions for users to scan different codes.As a fine-grained data encryption method,ciphertext policy attribute-based encryption (CP-ABE) can realize user access control while ensuring data security,and realize information transmission in one-to-many mode.Combining the characteristics and advantages of two-dimensional code and ciphertext policy attribute-based encryption technology,a two-dimensional code encryption scheme based on revocable outsourcing attribute encryption was proposed.The information block based on the rights division is secondarily encrypted,and then outsourced to the server for corresponding decryption and permission matching.Then the first decrypts ciphertext is returned to the user,and the user obtains the private key by scanning the code and decrypts it twice to get the plaintext.The generation of the two-dimensional code can vary with the different random keys.Through the analysis of the security of the scheme,it is proved that the scheme has forward security,backward security and selective plaintext attack security (IND-CPA) under the bilinear q-BDHE assumption.Through the design experiments,it is verified that the scheme can realize the one-to-many information of the two-dimensional code while ensuring the security of the two-dimensional code information.This scheme has the advantages of low computational overhead on the client side,reversible attributes,and random generation of two-dimensional codes.

Key words: Attribute encryption, Outsourcing, Revocable, Two-dimensional code

中图分类号:

TP309

高丹, 凌捷, 陈家辉. 基于可撤销外包属性加密的二维码加密[J]. 计算机科学, 2019, 46(12): 186-191. https://doi.org/10.11896/jsjkx.181102187

GAO Dan, LING Jie, CHEN Jia-hui. Two-dimensional Code Encryption Based on Revocable Outsourced Attribute Encryption[J]. Computer Science, 2019, 46(12): 186-191. https://doi.org/10.11896/jsjkx.181102187

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