User Interface Design for Privacy Enhancing Technology
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A significant amount of information is available of us online due to the increased use of the Internet and online services. It appears to be a tendency among users to not read privacy policies when creating user accounts online because policies are known to be long and complicated documents that are hard to understand. Users also feel like they don't really have a choice than to accept the policy if they want to use the service. This have created privacy concerns and a need for better privacy control for users, since the users usually don't know what they have agreed to when accepting policies.SINTEF ICT have developed a privacy enhancing technology (PET), named Privacy Advisor, whose purpose is to help users think about privacy and information sharing online. This is done by Privacy Advisor interpreting webpages privacy policies for the users and giving advices on whether the webpages should be trusted or not. The users are then given the opportunity to provide feedback to Privacy Advisor and the system will use this to adapt to the users privacy preferences. A graphical user interface (GUI) for Privacy Advisor were developed using prototyping with iterative improvement of the design, based on feedback from SINTEF ICT and potential users. Feedback from users was collected by performing usability testing with observation, followed by a questionnaire. Usability testing was also conducted to determine the designs usability and find breakdowns in the design. The feedback showed that there were some breakdowns in the system. These were presentation of text that was confusing for some users, where they did not understand the meaning of the text, or buttons that was not intuitive enough. These breakdowns were fixed for the final version of the design suggestion. The users also navigated well in the prototype and managed to complete all the given tasks. The system also received positive feedback concerning further use and the need for a program like Privacy Advisor, and because of these elements, the usability were determined as good when the final improvements and fixing of breakdowns were completed. A final design for Privacy Advisor, implemented as a Google Chrome extension was then presented to SINTEF ICT.