Infranet: Circumventing Web Censorship and Surveillance

摘要: An increasing number of countries and companies routinely block or monitor access to parts the Internet. To counteract these measures, we propose Infranet, a system that enables clients surreptitiously retrieve sensitive content via cooperating Web servers distributed across global These Infranet provide censored sites while continuing host normal uncensored content. uses tunnel protocol provides covert communication channel between its servers, modulated over standard HTTP transactions resemble innocuous browsing. In upstream direction, send messages by associating meaning sequence requests being made. downstream return hiding data in images using steganographic techniques. We describe design, prototype implementation, security properties, performance Infranet. Our analysis shows can successfully circumvent several sophisticated censoring