Recent works have shown great potentials for enhancing satellite communications (SATCOM) in terms of security and privacy from blockchains and smart contracts. However, smart contracts deployed on the blockchain also suffer from various attacks, e.g., illegal trigger and access, continuous intrusion, which causes critical threats toward blockchain-based SATCOM. In this paper, we first design a token-based access control mechanism for smart contracts with dynamic adjustment of the access control rules (ACRs), which guarantees that only authorized users can trigger and execute specific smart contracts. We then propose an intrusion detection mechanism for smart contracts to detect attacks against smart contracts in an effective and real-time way. Based on these mechanisms, we propose an access control and intrusion detection framework, dubbed ACID, to resist various attacks while remaining all characteristics and functionalities of the underlying blockchain-based SATCOM system. We conduct a comprehensive evaluation, which demonstrates that ACID is secure, feasible, and efficient.

最近的工作显示出在增强区块链和智能合约的安全性和隐私性方面增强卫星通信（SATCOM）的巨大潜力。但是，部署在区块链上的智能合约还遭受各种攻击，例如非法触发和访问，持续入侵，这对基于区块链的SATCOM构成了严重威胁。在本文中，我们首先设计了一种基于令牌的智能合约访问控制机制，并动态调整了访问控制规则（ACR），以确保只有授权用户才能触发和执行特定的智能合约。然后，我们提出了一种用于智能合约的入侵检测机制，以有效，实时的方式检测对智能合约的攻击。基于这些机制，我们提出了一种称为ACID的访问控制和入侵检测框架，在保留基于底层区块链的SATCOM系统的所有特征和功能的同时，抵御各种攻击。我们进行了全面的评估，表明ACID是安全，可行和高效的。