Bypassing Tor Exit Blocking with Exit Bridge Onion Services

Bypassing Tor Exit Blocking with Exit Bridge Onion Services
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使用 Exit Bridge Onion Services 绕过 Tor 出口封锁

DOI:
10.1145/3372297.3417245
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发表时间:
2020
期刊:
2020 ACM Conference on Computer and Communications Security
影响因子:
--
通讯作者:
Sherr, Micah
Sherr, Micah
中科院分区:
--
文献类型:
--
作者:
Zhang, Zhao;Zhou, Wenchao;Sherr, Micah

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Tor退出阻止,即网站不允许来自Tor的客户端,是对匿名网络的一个日益增长的潜在存在威胁。本文介绍了HebTor,一个新的和强大的出口桥体系结构-短期代理,作为替代出口点的Tor。HebTor的一个关键见解是出口桥可以作为Tor洋葱服务运行,允许任何可以创建出站TCP连接的设备作为出口桥,而不管NAT和/或防火墙的存在。HebTor采用小额支付系统来补偿出口桥运营商的服务,以及防止白吃白喝的隐私保护声誉计划。我们证明了HebTor有效地阻止了Tor的服务器端阻塞,我们描述了我们设计的安全性,隐私性和法律的影响。
Tor exit blocking, in which websites disallow clients arriving from Tor, is a growing and potentially existential threat to the anonymity network. This paper introduces HebTor, a new and robust architecture for exit bridges---short-lived proxies that serve as alternative egress points for Tor. A key insight of HebTor is that exit bridges can operate as Tor onion services, allowing any device that can create outbound TCP connections to serve as an exit bridge, regardless of the presence of NATs and/or firewalls. HebTor employs a micropayment system that compensates exit bridge operators for their services, and a privacy-preserving reputation scheme that prevents freeloading. We show that HebTor effectively thwarts server-side blocking of Tor, and we describe the security, privacy, and legal implications of our design.
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