Current in-situ privacy solution approaches are inadequate in protecting sensitive information. They either require extra
\nconfiguration effort or lack the ability to configure user desired privacy settings. Based on in-depth discussions during a design
\nworkshop, we propose PrivacyShield, a mobile system for providing subtle just-in-time privacy provisioning. PrivacyShield
\nleverages the screen I\/O device (screen digitizer) of smartphones to recognize gesture commands, even when the phone\u2019s screen
\nis turned off. Based on gesture command inputs, various privacy-protection policies can be configured on-the-fly. We develop
\na novel stroke-based approach to address the challenges in segmenting and recognizing gesture command inputs, which
\nhelps the system in achieving good usability and performance. PrivacyShield also provides developers with APIs to enable
\njust-in-time privacy provisioning in their applications. We have implemented an energy efficient PrivacyShield prototype on
\nthe Android platform, including smartphones with and without a low-power co-processor. Evaluation results show that our
\ngesture segmentation algorithm is fast enough for real-time performance (introducing less than 200ms processing latency)
\nand accurate (achieving an accuracy of 95% for single-character gestures and 89% for even three-character gestures). We also
\nbuild a non-touch-screen-based just-in-time privacy provisioning prototype called the wrist gesture method. We compare the
\nperformance of the two prototypes by doing a 6-week field study with 12 participants and show why a simplistic solution
\nfalls short in providing privacy configurations. We also report the participants\u2019 perceptions and reactions after the field study.<\/p>\n","protected":false},"excerpt":{"rendered":"
Current in-situ privacy solution approaches are inadequate in protecting sensitive information. They either require extra configuration effort or lack the ability to configure user desired privacy settings. Based on in-depth discussions during a design workshop, we propose PrivacyShield, a mobile system for providing subtle just-in-time privacy provisioning. 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