《计算机应用》唯一官方网站 ›› 2026, Vol. 46 ›› Issue (4): 1191-1198.DOI: 10.11772/j.issn.1001-9081.2025040464

• 网络空间安全 • 上一篇    

基于椭圆曲线的无证书可链接环签名方案

蒋沁昆1, 缪祥华1,2(), 郭冰雨1, 阮兴磊1   

  1. 1.昆明理工大学 信息工程与自动化学院,昆明 650504
    2.云南省计算机技术应用重点实验室(昆明理工大学),昆明 650504
  • 收稿日期:2025-04-28 修回日期:2025-06-16 接受日期:2025-06-23 发布日期:2025-06-27 出版日期:2026-04-10
  • 通讯作者: 缪祥华
  • 作者简介:蒋沁昆(2000—),男,广西桂林人,硕士研究生,CCF会员,主要研究方向:信息安全、数字签名
    郭冰雨(2001—),女,山西运城人,硕士研究生,CCF会员,主要研究方向:信息安全、格密码学、数字签名
    阮兴磊(2001—),男,云南寻甸人,硕士研究生,主要研究方向:信息安全、同态加密。
  • 基金资助:
    云南省重大专项(202302AD080002)

Certificateless linkable ring signature scheme based on elliptic curves

Qinkun JIANG1, Xianghua MIAO1,2(), Bingyu GUO1, Xinglei RUAN1   

  1. 1.Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming Yunnan 650504,China
    2.Yunnan Key Laboratory of Computer Technology Application (Kunming University of Technology),Kunming Yunnan 650504,China
  • Received:2025-04-28 Revised:2025-06-16 Accepted:2025-06-23 Online:2025-06-27 Published:2026-04-10
  • Contact: Xianghua MIAO
  • About author:JIANG Qinkun, born in 2000, M. S. candidate. His research interests include information security, digital signature.
    GUO Bingyu, born in 2001, M. S. candidate. Her research interests include information security, lattice-based cryptography, digital signature.
    RUAN Xinglei, born in 2001, M. S. candidate. His research interests include information security, homomorphic encryption.
  • Supported by:
    Yunnan Province Major Special Project(202302AD080002)

摘要:

可链接环签名不仅继承了环签名的优势,且在签名方案中嵌入链接标签使验证者可以确定2个签名是否由同一签名者生成,从而解决了滥用或重复签名的问题;无证书公钥密码(CL-PKC)体制可解决密钥托管问题和证书管理问题,从而提高了安全性。结合上述两者的优点,提出一种基于椭圆曲线的无证书可链接环签名方案(CL-LRS),构建该方案的系统模型和安全模型,并在随机预言机模型下证明该方案能抵抗Ⅰ/Ⅱ型敌手攻击,且具备匿名性、不可伪造性、可链接性和不可诽谤性。为了验证所提方案的实际性能,通过计算签名方案中使用的各密码运算的时间对所提方案与现有的几种基于椭圆曲线的环签名方案的签名开销和验签开销进行对比。实验结果表明,在不依赖双线性配对运算的情况下,所提方案仍然能抵抗恶意密钥生成中心(KGC)的攻击且能防范潜在的签名滥用行为,同时在签名总耗时上与基于椭圆曲线的可链接环签名相比降低了80.1%。可见,该方案适合于资源受限场景下的应用。

关键词: 可链接环签名, 无证书公钥密码, 随机预言机模型, 匿名性, 不可伪造性

Abstract:

Linkable ring signatures not only inherit the advantages of ring signatures, but also embed link tags in the signature scheme, enabling verifiers to determine whether two signatures are generated by the same signer, which addresses the issues of abuse or repeated signatures effectively. The CertificateLess Public Key Cryptography (CL-PKC) system can solve the problems of key escrow and certificate management, thereby enhancing security. By combining the advantages of the above two, a CertificateLess Linkable Ring Signature scheme (CL-LRS) based on elliptic curves was proposed, the system model and security model of the scheme were constructed, and the scheme was proven secure against Type Ⅰ/Ⅱ adversary attacks under random oracle model with anonymity, unforgeability, linkability, and non-slanderability. To verify the practical performance of the proposed scheme, the signature overhead and signature verification overhead of the proposed scheme were compared with those of several existing elliptic-curve-based ring signature schemes by calculating the time of each cryptographic operation used in the signature scheme. Experimental results indicate that without relying on bilinear pairing operations, the proposed scheme can still resist attacks from malicious Key Generation Centers (KGCs) and prevent potential signature abuse. Meanwhile, the total signature time of the proposed scheme is reduced by 80.1% compared with that of the elliptic-curve-based linkable ring signature. It can be seen that the scheme is suitable for applications in resource-constrained scenarios.

Key words: linkable ring signature, CertificateLess Public Key Cryptography (CL-PKC), random oracle model, anonymity, unforgeability

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