In this paper, we propose a blockchain-based collaborative credential management scheme for anonymous authentication in space-air-ground integrated vehicular networks (SAGVN), named SAG-BC. First, we build a consortium blockchain among service providers and design a distributed system setup (DSS) scheme to securely generate public parameters for issuing credentials. Second, we design a collaborative credential issuance (CCI) scheme to generate a succinct and easy-to-manage subscription credential. The credential can be used by users to access different access points in SAGVN efficiently without revealing true identities from the authentication messages. With co-designs of zero-knowledge proofs and succinct on-chain commitments, SAG-BC provides efficient verifiability and incentives for credential management operations in SAGVN. By doing so, expensive on-chain storage and computational overheads are reduced in the DSS and CCI. Finally, we conduct a thorough security analysis to demonstrate that SAG-BC achieves security and verifiability for credential management in SAGVN. We set up a real-world blockchain network and conduct extensive experiments to show the feasibility and efficiency of SAG-BC.

中文翻译：

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SAGVN 中基于区块链的匿名身份验证凭证管理


在本文中，我们提出了一种基于区块链的协作凭证管理方案，用于空地一体化车载网络（SAGVN）中的匿名身份验证，名为SAG-BC。首先，我们在服务提供商之间建立一个联盟链，并设计一个分布式系统设置（DSS）方案来安全地生成用于颁发凭证的公共参数。其次，我们设计了一种协作凭证发行（CCI）方案来生成简洁且易于管理的订阅凭证。用户可以使用该凭证有效地访问 SAGVN 中的不同接入点，而无需从身份验证消息中泄露真实身份。通过零知识证明和简洁的链上承诺的共同设计，SAG-BC 为 SAGVN 中的凭证管理操作提供了高效的可验证性和激励。通过这样做，可以减少 DSS 和 CCI 中昂贵的链上存储和计算开销。最后，我们进行彻底的安全分析，证明 SAG-BC 实现了 SAGVN 中凭证管理的安全性和可验证性。我们建立了一个现实世界的区块链网络并进行了大量的实验来展示SAG-BC的可行性和效率。