Blockchain systems encompass many distinct and autonomous entities, each utilizing its own self-contained identity authentication algorithm. Unlike identity authentication within a singular blockchain, cross-chain scenarios demand special attention due to their pivotal role in enabling the acknowledgment of users’ identities across diverse domains. This capability is the foundational prerequisite for the circulation of resources across different chains. Consequently, the central challenge for cross-chain systems lies in establishing mutual recognition and trust in users’ digital identities. This paper proposes a Multi-User Proxy Re-Signature (MU-PRS) algorithm, facilitating the cross-chain conversion of signatures from multiple users. Concurrently, This paper propose the Multi-Notary Signature Conversion (MN-SC) mechanism, designed to address the challenge posed by disparate system mechanisms across blockchains during cross-chain authentication. Leveraging the MU-PRS algorithm and MN-SC mechanism, we present a Multi-User Cross-Chain Authentication Scheme (MU-CCAS) within a heterogeneous blockchain environment. This scheme enables the verification of identities of multiple cross-chain users through a single signature verification. This innovative approach not only addresses the centralization issues inherent in third-party cross-chain authentication but also significantly enhances the efficiency of identity authentication. The evaluation results demonstrate MU-CCAS’s superior security over existing solutions in three dimensions: BAN logic, Scyther verification, and security attribute analysis. Additionally, it establishes that MU-PRS and MU-CCAS have low computational overhead, easy implementation, and excel in algorithm, scheme, and cross-chain performance. Overall, our work provides a robust and efficient framework for cross-chain authentication, addressing centralization challenges and enhancing digital security.

中文翻译：

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从跨链角度重塑多用户认证安全


区块链系统包含许多不同的自治实体，每个实体都利用自己独立的身份验证算法。与单一区块链内的身份认证不同，跨链场景需要特别关注，因为它们在跨不同域确认用户身份方面发挥着关键作用。这种能力是资源跨链流通的基础前提。因此，跨链系统的核心挑战在于建立对用户数字身份的相互认可和信任。本文提出了一种多用户代理重签名（MU-PRS）算法，方便多个用户签名的跨链转换。同时，本文提出了多公证签名转换（MN-SC）机制，旨在解决跨链认证过程中跨区块链不同系统机制带来的挑战。利用MU-PRS算法和MN-SC机制，我们在异构区块链环境中提出了多用户跨链认证方案（MU-CCAS）。该方案可以通过一次签名验证来验证多个跨链用户的身份。这种创新方法不仅解决了第三方跨链认证固有的中心化问题，而且显着提高了身份认证的效率。评估结果从BAN逻辑、Scyther验证、安全属性分析三个维度证明了MU-CCAS优于现有解决方案的安全性。此外，它还表明MU-PRS和MU-CCAS计算开销低，易于实现，并且在算法、方案和跨链性能方面表现出色。 总的来说，我们的工作为跨链身份验证提供了一个强大而高效的框架，解决了中心化挑战并增强了数字安全性。