Internet blackouts, occurring due to technological mishaps or intentional governmental action, prevent citizens from accessing the internet. Citizens in regions where internet blackouts are common have utilized blackout-resistant technologies to maintain communication. Such technologies often rely on mobile mesh networks to provide limited messaging services. However, no technology currently exists which can provide continued access to knowledge sources on the web during a blackout. We present Cache to the Future (CttF): a system to cache and deliver static content hosted on the web during a blackout. CttF's distributed community ratings crowdsources caching at scale while cryptographic constructs (digital signatures, proofs-of-work) mitigate adversarial interference. Our realistic simulations demonstrate CttF delivering content at city-scale across a wide range of benign and adversarial scenarios.

翻译：互联网断网事件（无论由技术故障或政府蓄意行为引发）均会阻断公民对互联网的访问。在断网频发地区的民众已采用抗断网技术维持通信，此类技术通常依赖移动网状网络提供有限的消息传递服务。然而，目前尚无技术能在断网期间持续提供网络知识源访问能力。本文提出"面向未来的缓存"（Cache to the Future, CttF）系统，该系统可在断网期间缓存并分发托管于网络中的静态内容。CttF通过分布式社区评分实现大规模众包缓存，同时运用密码学构造（数字签名、工作量证明）抵御恶意干扰。仿真实验表明，CttF能在城市级规模下，于多种良性及对抗性场景中高效分发内容。