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The drunk motorcyclist protocol for anonymous communication

机译：醉酒的托运单车司机协议匿名通信

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The buses protocol is designed to provide provably anonymous communication on a connected graph. Figuratively speaking, a bus is a single unit of transport containing multiple seats. Each seat carries a ciphertext from a sender to a receiver. The buses approach aims to conceal traffic patterns by having buses constantly travel along fixed routes and is a step forward in concealing traffic compared to other anonymous communication protocols. Therefore, in this day in which Internet privacy is crucial it deserves further investigation. Here, we cryptanalyze the reduced-seat Buses protocol and we also present distinguishing attacks against the related Taxis protocol as well as P. These attacks highlight the need to employ cryptosystems with key-privacy in such protocols. We then show that anonymity is not formally proven in the buses protocols. These findings motivate the need for a new provably secure connectionless anonymous messaging protocol. We present what we call the drunk motorcyclist (DM) protocol for anonymous messaging that overcomes these issues. We define the DM protocol, show a construction for it, and then prove that anonymity and confidentiality hold under Decision Diffie-Hellman (DDH) against global active adversaries. Our protocol demonstrates the new principle of flooding a complete graph or an expander graph with randomly walking ciphertexts that travel until their time-to-live values expire. This principle also exhibits fault-tolerance properties.
机译：总线协议旨在在连接的图表上提供可透明的匿名通信。比喻性地，公共汽车是包含多个座位的单个运输单位。每个座位从发件人带到接收器的密文。总线方法旨在通过沿着固定路线不断行驶的公共汽车来隐藏交通模式，并且与其他匿名通信协议相比隐藏流量的前进前进。因此，在互联网隐私至关重要的这一天，它应该得到进一步的调查。在这里，我们加密分析座位的总线协议，我们还表现出与相关的出租车协议以及P的区别攻击。这些攻击突出了在这些协议中使用密钥隐私的需要使用密码系统。然后，我们表明匿名在公共汽车协议中没有正式证明。这些发现激励了对新的可证实安全无连接匿名消息传递协议的需求。我们介绍了我们称之为醉酒的托运MOTYCLIST（DM）协议，以便克服这些问题的匿名消息。我们定义了DM协议，显示了它的结构，然后证明了匿名和机密性在决策Diffie-Hellman（DDH）下对全球活跃的对手。我们的协议展示了泛洪完整图形或扩展器图的新原则，其中随机行走的密文，直到它们的超时值到期。该原理也表现出容错性能。

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