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 …

Voice interfaces are becoming more ubiquitous and are now the primary input method for
many devices. We explore in this paper how they can be attacked with hidden voice …

The Internet plays an increasingly important role in people's lives, but it also brings security
problems. CAPTCHA, which stands for Completely Automated Public Turing Test to Tell …

Reliably recruiting participants with programming skills is an ongoing challenge for empirical
studies involving software development technologies, often leading to the use of …

For people with visual impairments (PVIs), audio CAPTCHAs are accessible alternatives to
standard visual CAPTCHAs. However, current audio CAPTCHA designs are slower to …

Abstract CAPTCHA, Completely Automated Public Turing test to tell Computers and Humans
Apart, is widely used as a security mechanism to classify human and computer. This security …

Cryptographic algorithms have been used not only to create robust ciphertexts but also to
generate cryptograms that, contrary to the classic goal of cryptography, are meant to be …

CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart)
is a widely used technology to distinguish real users and automated users such as bots …

CAPTCHAs (completely automated public Turing tests to tell computers and humans apart)
have been the main protection against malicious attacks on public systems for many years …

This paper presents novel attacks on voice-controlled digital assistants using nonsensical
word sequences. We present the results of a small-scale experiment which demonstrates …