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ACM Transactions on Privacy and Security (TOPS), Volume 19 Issue 4, February 2017

Toward Improved Audio CAPTCHAs Based on Auditory Perception and Language Understanding
Hendrik Meutzner, Santosh Gupta, Viet-Hung Nguyen, Thorsten Holz, Dorothea Kolossa
Article No.: 10
DOI: 10.1145/2856820

A so-called completely automated public Turing test to tell computers and humans apart (CAPTCHA) represents a challenge-response test that is widely used on the Internet to distinguish human users from fraudulent computer programs, often referred...

Privacy Games Along Location Traces: A Game-Theoretic Framework for Optimizing Location Privacy
Reza Shokri, George Theodorakopoulos, Carmela Troncoso
Article No.: 11
DOI: 10.1145/3009908

The mainstream approach to protecting the privacy of mobile users in location-based services (LBSs) is to alter (e.g., perturb, hide, and so on) the users’ actual locations in order to reduce exposed sensitive information. In order to be...

Evaluating the Privacy Guarantees of Location Proximity Services
George Argyros, Theofilos Petsios, Suphannee Sivakorn, Angelos D. Keromytis, Jason Polakis
Article No.: 12
DOI: 10.1145/3007209

Location-based services have become an integral part of everyday life. To address the privacy issues that emerge from the use and sharing of location information, social networks and smartphone applications have adopted location proximity schemes...