Dissent is an anonymous communication system that offers much stronger anonymity guarantees than Tor. Dissent clients efficiently publish anonymous messages, but any response must be broadcast to all clients. This approach does not scale to many clients or large responses. We’ve developed a private information retrieval scheme that enables clients to receieve responses without the bandwidth bur...

In 2009, basic care packages (BCP) containing health products were distributed to HIV-infected persons in Ethiopia who were clients of antiretroviral therapy clinics. To measure health impact, we enrolled clients from an intervention hospital and comparison hospital, and then conducted a baseline survey, and 7 bi-weekly home visits. We enrolled 405 intervention group clients and 344 comparison ...