We construct new private-information-retrieval protocols in the single-server setting. Our
schemes allow a client to privately fetch a sequence of database records from a server …

Anonymous Committed Broadcast is a functionality that extends DC-nets and allows a set of
clients to privately commit messages to set of servers, which can then simultaneously open …

Recent private information retrieval (PIR) schemes preprocess the database with a query-
independent offline phase in order to achieve sublinear computation during a query-specific …

We present Sabre, a family of sender-anonymous messaging protocols with instances
supporting both Twitter-like anonymous bulletin boards and Secure Drop-like mailboxes …

Many real-world group messaging systems delegate group administration to the application
level, failing to provide formal guarantees related to group membership. Taking a …

Protecting metadata of communications has been an area of active research since the
dining cryptographers problem was introduced by David Chaum in 1988. The Snowden …

Authenticated PIR enables a server to initially commit to a database of $ N $ items, for which
a client can later privately obtain individual items with complexity sublinear in $ N $, with the …

Trellis is a mix-net based anonymous broadcast system with cryptographic security
guarantees. Trellis can be used to anonymously publish documents or communicate with …

Abstract Private Information Retrieval (PIR) allows a client to retrieve one entry from a
database held by a server, while hiding from the server which entry has been retrieved …

Anonymity networks allow messaging with metadata privacy, providing better privacy than
popular encrypted messaging applications. However, contacting a user on an anonymity …