Usable privacy and security researchers have developed a variety of approaches to
represent risk to research participants. To understand how these approaches are used and …

Security and privacy researchers often rely on data collected from Amazon Mechanical Turk
(MTurk) to evaluate security tools, to understand users' privacy preferences and to measure …

The computer security community has advocated widespread adoption of secure
communication tools to counter mass surveillance. Several popular personal communication …

Secure instant messaging is utilized in two variants: one-to-one communication and group
communication. While the first variant has received much attention lately (Frosch et al …

Many authentication schemes ask users to manually compare compact representations of
cryptographic keys, known as fingerprints. If the fingerprints do not match, that may signal a …

The effective security provided by secure messaging applications depends heavily on users
completing an authentication ceremony| a sequence of manual operations enabling users to …

Communication tools with end-to-end (E2E) encryption help users maintain their privacy.
Although messengers like WhatsApp and Signal bring E2E encryption to a broad audience …

End-to-end (E2E) encrypted communication tools can help users keep their communications
secure from government or corporate surveillance. In this work, we conduct a quantitative …

Trustworthy digital communication requires the secure exchange of contact information, but
current approaches lack usability and scalability for larger groups of users. We evaluate the …

E-voting has been embraced by a number of countries, delivering benefits in terms of
efficiency and accessibility. End-to-end verifiable e-voting schemes facilitate verification of …