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10 results on '"Qiao, Zhiqi"'

6. A Lattice-Based Homomorphic Proxy Re-Encryption Scheme with Strong Anti-Collusion for Cloud Computing

Author

Qiao Zhiqi, Ke-Jia Zhang, Chen Cui, and Juyan Li

Subjects
Theoretical computer science, Computer science, Data_MISCELLANEOUS, key switching, Cloud computing, trapdoor sampling, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, lcsh:Chemical technology, Biochemistry, Article, Analytical Chemistry, LWE, Computer Science::Multimedia, Ciphertext, 0202 electrical engineering, electronic engineering, information engineering, lcsh:TP1-1185, Electrical and Electronic Engineering, Proxy (statistics), Instrumentation, Computer Science::Cryptography and Security, business.industry, cloud computing, Homomorphic encryption, 020206 networking & telecommunications, Atomic and Molecular Physics, and Optics, Proxy re-encryption, homomorphic proxy re-encryption, Collusion, strong anti-collusion, Key (cryptography), 020201 artificial intelligence & image processing, Homomorphism, business
Abstract

The homomorphic proxy re-encryption scheme combines the characteristics of a homomorphic encryption scheme and proxy re-encryption scheme. The proxy can not only convert a ciphertext of the delegator into a ciphertext of the delegatee, but also can homomorphically calculate the original ciphertext and re-encryption ciphertext belonging to the same user, so it is especially suitable for cloud computing. Yin et al. put forward the concept of a strong collusion attack on a proxy re-encryption scheme, and carried out a strong collusion attack on the scheme through an example. The existing homomorphic proxy re-encryption schemes use key switching algorithms to generate re-encryption keys, so it can not resist strong collusion attack. In this paper, we construct the first lattice-based homomorphic proxy re-encryption scheme with strong anti-collusion (HPRE-SAC). Firstly, algorithm TrapGen is used to generate an encryption key and trapdoor, then trapdoor sampling is used to generate a decryption key and re-encryption key, respectively. Finally, in order to ensure the homomorphism of ciphertext, a key switching algorithm is only used to generate the evaluation key. Compared with the existing homomorphic proxy re-encryption schemes, our HPRE-SAC scheme not only can resist strong collusion attacks, but also has smaller parameters.

Published
2021

7. China's environmental protection objectives by the year 2000

Author

Han Guogang, Qiao Zhiqi, Hou Bingzheng, Liu Shuangjin, Zhu Zhongjie, Sun Rongqing, Mao Wenyong, and Zhang Xingquo

Subjects
China -- Environmental policy, Environmental law -- China, Environmental protection -- Laws, regulations and rules, Economics, Sociology and social work
Published
1991

9. China's Environmental Protection Objectives by the Year 2000

Author

Liu Shuangjin, Sun Rongqing, Han Guogang, Zhang Xingquo, Zhu Zhongjie, Mao Wenyong, Hou Bingzheng, and Qiao Zhiqi

Subjects
Economics and Econometrics, business.industry, Environmental resource management, General Social Sciences, Water supply, Environmental pollution, Natural resource, Environmental law, Environmental education, Environmental Sustainability Index, Environmental protection, Environmental management system, business, Environmental planning, Environmental quality
Abstract

The general objectives of environmental protection by the year 2000 are: o basic control of environmental pollution o enhancement of environmental quality of major cities o co‐ordination of environmental, economic and social development. Proposals are listed and suggestions for the main measures to be undertaken are given for the advances that should be made by 2000 with respect to: (1) cities and economic areas; (2) industrial pollution; (3) pollution and construction of rural environment; (4) use and conservation of natural resources; (5) conservation of the water supply; (6) protection of the marine environment; (7) scientific and technological progress and environmental education; and (8) environmental management.

Published
1991

10. A Ring Learning with Errors-Based Ciphertext-Policy Attribute-Based Proxy Re-Encryption Scheme for Secure Big Data Sharing in Cloud Environment.

Author

Li J, Peng J, and Qiao Z

Subjects
Information Dissemination, Algorithms, Cloud Computing, Computer Security, Big Data
Abstract

Owing to the huge volume of big data, users generally use the cloud to store big data. However, because the data are out of the control of users, sensitive data need to be protected. The ciphertext-policy attribute-based encryption scheme can not only effectively control the access of big data, but also decrypt the ciphertext as long as the user's attributes satisfy the access structure of ciphertext, so as to realize one to many big data sharing. When the user's attributes do not satisfy the access structure of ciphertext, the attribute-based proxy re-encryption scheme can be used for big data sharing. The ciphertext-policy attribute-based proxy re-encryption (CP-ABPRE) scheme combines the characteristics of the ciphertext-policy attribute-based encryption scheme and proxy re-encryption scheme. In a CP-ABPRE scheme, on the one hand, the data owner can use the ciphertext-policy attribute-based encryption scheme to encrypt the big data for cloud storage, to realize the access control of the big data. On the other hand, the proxy (cloud service provider) can convert ciphertext under one access structure into ciphertext under another access structure, thus realizing big data sharing between users of different attribute sets. In this article, we modify the existing attribute-based encryption scheme based on Ring Learning With Errors (RLWE), add re-encryption key generation algorithm, re-encryption ciphertext generation algorithm, and re-encryption ciphertext decryption algorithm, and construct CP-ABPRE scheme. In the construction of the re-encryption key, we introduce a random vector and hide the vector in the key by threshold technology. Finally, a CP-ABPRE scheme supporting threshold access structure is constructed based on RLWE. Compared with the existing attribute-based proxy re-encryption schemes, our scheme has smaller public parameters, can encrypt multiple plaintext bits at a time, and can resist selective access structure and chosen plaintext attack, so it is more suitable for big data sharing in cloud environment.

Published
2024
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