Abuse Resistant Law Enforcement Access Systems

Abuse Resistant Law Enforcement Access Systems
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防滥用执法访问系统

DOI:
10.1007/978-3-030-77883-5_19
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发表时间:
2021
期刊:
EUROCRYPT 2021
影响因子:
--
通讯作者:
Green, M.
Green, M.
中科院分区:
--
文献类型:
--
作者:
Green, M.

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越来越多的端到端加密通信服务的部署引发了技术公司和执法机构之间关于合法访问加密通信的必要性的辩论。不幸的是,该问题的现有解决方案存在严重的技术风险,例如运营商滥用和盗窃托管密钥材料的可能性。在这项工作中,我们调查的问题,建设执法访问系统,减轻未经授权的监视的可能性。我们首先定义了一组理想的属性为滥用抵抗执法访问系统(ARLEAS),并激励这些属性。然后,我们正式这些定义的通用可组合性(UC)的框架,并提出了两个主要的建设,实现这一定义。第一种结构允许前瞻性访问,只有在授权令发布和激活后加密时才允许监视。第二个,更强大的结构,允许追溯访问在搜查令发布之前发生的通信。为了说明构建后一种类型的协议的技术挑战,我们最后通过调查实现这些系统所需的最小假设。
The increasing deployment of end-to-end encrypted communications services has ignited a debate between technology firms and law enforcement agencies over the need for lawful access to encrypted communications. Unfortunately, existing solutions to this problem suffer from serious technical risks, such as the possibility of operator abuse and theft of escrow key material. In this work we investigate the problem of constructing law enforcement access systems that mitigate the possibility of unauthorized surveillance. We first define a set of desirable properties for an abuse-resistant law enforcement access system (ARLEAS), and motivate each of these properties. We then formalize these definitions in the Universal Composability (UC) framework, and present two main constructions that realize this definition. The first construction enablesprospectiveaccess, allowing surveillance only if encryption occurs after a warrant has been issued and activated. The second, more powerful construction, allowsretrospectiveaccess to communications that occurred prior to a warrant’s issuance. To illustrate the technical challenge of constructing the latter type of protocol, we conclude by investigating the minimal assumptions required to realize these systems.
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