Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Mobile computing is the new norm. As people feel increasingly comfortable computing in public places such as coffee shops and transportation hubs, the threat of exposing sensitive information increases. While solutions exist to guard the communication channels used by mobile devices, the visual channel remains, to a significant degree, open. Shoulder surfing is becoming a viable threat in a world where users are frequently surrounded by high-power cameras, and where sensitive information from recorded images can be extracted with modest computing power. In response, this dissertation presents Cashtags: a system to defend against attacks on mobile devices based on visual observations. The system allows users to access sensitive information in public without the fear of visual leaks. This is accomplished by intercepting sensitive data elements before they are displayed on screen, then replacing them with non-sensitive information. In addition, the system provides a means of computing with sensitive data in a non-observable way. All of this is accomplished while maintaining full functionality and legacy compatibility across applications.
Anonymity, Human-computer Interaction, Mobile Systems, Privacy, Security
Date of Defense
April 15, 2015.
A Dissertation submitted to the Department of Computer Science in partial fulfillment of the Doctor of Philosophy.
Includes bibliographical references.
An-I Andy Wang, Professor Directing Dissertation; Linda DeBrunner, University Representative; Gary Tyson, Committee Member; Zhi Wang, Committee Member.
Florida State University
Use and Reproduction
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). The copyright in theses and dissertations completed at Florida State University is held by the students who author them.