Towards Anonymous Neural Network Inference

We introduce funion, a system providing end-to-end sender-receiver unlinkability for neural network inference. By leveraging the Pigeonhole storage protocol and BACAP blinding-and-capability scheme from the Echomix anonymity system, funion inherits the provable security guarantees of modern...

Metadata-Private Messaging without Coordination

For those seeking end-to-end private communication free from pervasive metadata tracking and censorship, the Tor network has been the de-facto choice in practice, despite its susceptibility to traffic analysis attacks. Recently, numerous metadata-private messaging proposals have emerged with the...

BIT-DISCOURSE-2023-25819 Discourse tags with no visibility are leaking into og:article:tag

Discourse is an open source platform for community discussion. Tags that are normally private are showing in metadata. This affects any site running the tests-passed or beta branches = 3.1.0.beta2. The issue is patched in the latest beta and tests-passed version of Discourse...

Facebook’s history betrays its privacy pivot

Facebook CEO Mark Zuckerberg proposed a radical pivot for his company this month: it would start caring—really—about privacy, building out a new version of the platform that turns Facebook less into a public, open “town square” and more into a private, intimate “living room.” Zuckerberg promised...

Vuvuzela - Private Messaging System That Hides Metadata

Vuvuzela is a messaging system that protects the privacy of message contents and message metadata. Users communicating through Vuvuzela do not reveal who they are talking to, even in the presence of powerful nation-state adversaries. Our SOSP 2015 paper explains the system, its threat model,...