ABC-Channel：一种先进的基于区块链的隐蔽信道
ABC-Channel: An Advanced Blockchain-based Covert Channel
AI总结：
本文提出首个全生命周期隐蔽信道ABC-Channel，通过无接触协商、不可区分交易特征和不可追踪身份，解决链上链下防御问题，在Bitcoin测试网验证了其高安全性与最先进传输效率。
摘要：
在不安全的网络环境中，建立高效且鲁棒的隐蔽信道对于安全通信至关重要。凭借其去中心化和匿名化的固有优势，区块链在开发隐蔽信道方面受到了广泛关注。为了保证高度安全的隐蔽信道，通信前信道协商应是无接触的，通信期间载体交易特征必须与正常交易无法区分，且通信后通信身份必须不可追踪。这种全生命周期隐蔽信道对于防御全面拦截通信双方（例如链上和链下）的强大对手是必不可少的。然而，文献中尚未对此进行深入研究。我们首次努力实现全生命周期隐蔽信道，提出了一种名为ABC-Channel的新型基于区块链的隐蔽信道。我们解决了一系列挑战，如链下接触依赖性、随交易量增长而增加的伪装难度，以及随时间演变、可通信但不可追踪的身份，分别实现了无接触信道协商、不可区分的交易特征和不可追踪的通信身份。我们开发了工作原型来验证ABC-Channel，并在Bitcoin测试网上进行了广泛测试。实验结果表明，ABC-Channel实现了高度安全的隐蔽能力。与现有方法相比，它还展现出最先进的传输效率。
英文摘要：
Establishing efficient and robust covert channels is crucial for secure communication within insecure network environments. With its inherent benefits of decentralization and anonymization, blockchain has gained considerable attention in developing covert channels. To guarantee a highly secure covert channel, channel negotiation should be contactless before the communication, carrier transaction features must be indistinguishable from normal transactions during the communication, and communication identities must be untraceable after the communication. Such a full-lifecycle covert channel is indispensable to defend against a versatile adversary who intercepts two communicating parties comprehensively (e.g., on-chain and off-chain). Unfortunately, it has not been thoroughly investigated in the literature. We make the first effort to achieve a full-lifecycle covert channel, a novel blockchain-based covert channel named ABC-Channel. We tackle a series of challenges, such as off-chain contact dependency, increased masquerading difficulties as growing transaction volume, and time-evolving, communicable yet untraceable identities, to achieve contactless channel negotiation, indistinguishable transaction features, and untraceable communication identities, respectively. We develop a working prototype to validate ABC-Channel and conduct extensive tests on the Bitcoin testnet. The experimental results demonstrate that ABC-Channel achieves substantially secure covert capabilities. In comparison to existing methods, it also exhibits state-of-the-art transmission efficiency.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
