Telephone networks first appeared more than a hundred years ago, long before transistors
were invented. They, therefore, form the oldest large scale network that has grown to touch …

Unsolicited telephone calls that facilitate fraud or unlawful telemarketing continue to
overwhelm network users and the regulators who prosecute them. The first step in …

Phones are used to confirm some of our most sensitive transactions. From coordination
between energy providers in the power grid to corroboration of high-value transfers with a …

Pretty Good Phone Privacy Page 1 This paper is included in the Proceedings of the 30th
USENIX Security Symposium. August 11–13, 2021 978-1-939133-24-3 Open access to the …

We present DONAR, a system enabling anonymous VoIP with good quality-of-experience
(QoE) over Tor. No individual Tor link can match VoIP networking requirements. DONAR …

Over the last decade, programmable data planes have enabled highly customizable and
efficient packet processing in commercial off-the-shelf hardware. Although researchers have …

Cellular networks connect nearly every human on the planet; they consequently have
visibility into location data and voice, SMS, and data contacts and communications. Such …

Caused by coronavirus SARS-CoV-2, the COVID-19 disease spreads particularly through
direct contact between people. Health authorities face the challenge of identifying and …

Use of mobile phones today has become pervasive throughout society. A common use of a
phone involves calling another person using VoIP apps. However the OSes on mobile …

We propose VoIPLoc, a novel location fingerprinting technique and apply it to the VoIP call
provenance problem. It exploits echo-location information embedded within VoIP audio to …