Existing systems for metadata-hiding messaging that provide cryptographic privacy
properties have either high communication costs, high computation costs, or both. In this …

After several years of research on onion routing, Camenisch and Lysyanskaya, in an attempt
at rigorous analysis, defined an ideal functionality in the universal composability model …

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 …

The recent SARS-CoV-2 pandemic gave rise to management approaches using mobile
apps for contact tracing. The corresponding apps track individuals and their interactions, to …

Featured Application Internet of Things and Industrial Internet of Things. Abstract Security
and privacy (SP)-related challenges constitute a significant barrier to the wider adoption of …

We analyze the anonymity provided by continuous mixnets (eg, Loopix) when messages
with different latency requirements are sent through the same network. The anonymity …

Anonymous communication systems are essential tools for preserving privacy and freedom
of expression. However, traffic analysis attacks make it challenging to maintain unlinkability …

Publish/Subscribe systems like Twitter and Reddit let users communicate with many
recipients without requiring prior personal connections. The content that participants of these …

In order to address the shortcomings of traditional anonymity network anonymity evaluation
methods, which only analyze from the perspective of the overall network and ignore the …

Messaging systems built on mesh networks consisting of smartphones communicating over
Bluetooth have been used by protesters around the world after governments have disrupted …