中国邮电高校学报(英文) ›› 2023, Vol. 30 ›› Issue (5): 51-60.doi: 10.19682/j.cnki.1005-8885.2023.0006

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Identity-based proxy re-encryption scheme from RLWE assumption with ciphertext evolution

孟慧1,任利娜1,赵宗渠2   

  1. 1. 河南理工大学
    2. 河南理工大学计算机科学与技术学院
  • 收稿日期:2022-09-28 修回日期:2023-03-05 出版日期:2023-10-31 发布日期:2023-10-30
  • 通讯作者: 赵宗渠 E-mail:zhaozong_qu@hpu.edu.cn
  • 基金资助:
    河南省高校基本科研业务费专项资金资助;河南省青年人才托举工程项目;“陕西省信息通信网络及安全重点实验室”开放课题

Identity-based proxy re-encryption scheme from RLWE assumption with ciphertext evolution

  1. College of Software, Henan Polytechnic University, Jiaozuo 454000, China
  • Received:2022-09-28 Revised:2023-03-05 Online:2023-10-31 Published:2023-10-30
  • Supported by:

    the Henan Key Laboratory of Network Cryptography Technology ( LNCT2022-A11 )

    the Shaanxi Key Laboratory of Information Communication Network and Security (ICNS202006).

摘要:

   Proxy re-encryption (PRE) allows users to transfer decryption rights to the data requester via proxy. Due to the current PRE schemes from lattice ( LPRE) cannot fulfill chosen-ciphertext attack ( CCA) security, an identity-based PRE (IB-PRE) scheme from learning with errors over ring ( RLWE) assumption with ciphertext evolution (IB-LPRE-CE) was proposed. IB-LPRE-CE generates the private key using the preimage sampling algorithm (SamplePre) and completes the ciphertext delegation using the re-encryption algorithm. In addition, for the problem of ciphertext delegation change caused by the long-term secret key update, the idea of PRE is used to complete ciphertext evolution and the modification of ciphertext delegation, which improves the efficiency of secure data sharing. In terms of security, IB-LPRE-CE is CCA security based on RLWE assumption. Compared with the current LPRE schemes, IB-LPRE-CE offers greater security and improves the computational efficiency of the encryption algorithm.

关键词: proxy re-encryption (PRE), learning with errors over ring ( RLWE), chosen-ciphertext attack ( CCA), ciphertext delegation, ciphertext evolution

Abstract:

   Proxy re-encryption (PRE) allows users to transfer decryption rights to the data requester via proxy. Due to the current PRE schemes from lattice ( LPRE) cannot fulfill chosen-ciphertext attack ( CCA) security, an identity-based PRE (IB-PRE) scheme from learning with errors over ring ( RLWE) assumption with ciphertext evolution (IB-LPRE-CE) was proposed. IB-LPRE-CE generates the private key using the preimage sampling algorithm (SamplePre) and completes the ciphertext delegation using the re-encryption algorithm. In addition, for the problem of ciphertext delegation change caused by the long-term secret key update, the idea of PRE is used to complete ciphertext evolution and the modification of ciphertext delegation, which improves the efficiency of secure data sharing. In terms of security, IB-LPRE-CE is CCA security based on RLWE assumption. Compared with the current LPRE schemes, IB-LPRE-CE offers greater security and improves the computational efficiency of the encryption algorithm.

Key words: proxy re-encryption (PRE), learning with errors over ring ( RLWE), chosen-ciphertext attack ( CCA), ciphertext delegation, ciphertext evolution

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