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Abstract. Modern smartphone platforms are highly privacy-affecting but not effective in properly communicating their privacy impacts to its users. Particularly, actual data-access behavior of apps is not considered in current privacy risk communication approaches. We argue that factors such as frequency of access to sensitive information is significantly affecting the privacy-invasiveness of applications. We introduce Styx, a novel privacy risk communication system that provides the user with more meaningful privacy information based on the actual behavior of apps. In a proof-of-concept study we evaluate the effectiveness of Styx. Our results show that more meaningful privacy warnings can increase user trust into smartphone platforms and also reduce privacy concerns.

Part 4: Phishing and Data SharingInternational audiencePrivacy and its protection is an important part of the culture in the USA and Europe. Literature in this field lacks empirical data from Japan. Thus, it is difficult– especially for foreign researchers – to understand the situation in Japan. To get a deeper understanding we examined the perception of a topic that is closely related to privacy: the perceived benefits of sharing data and the willingness to share in respect to the benefits for oneself, others and companies. We found a significant impact of the gender to each of the six analysed constructs

Abstract. The loss of control over a new-generation mobile device (e.g. loss of device or short time of inattention) can have negative impacts on the owner's privacy due to the increasing number of privacy-sensitive data stored on such devices. Current mobile platforms either lack the required protection mechanisms or the implementations lack a balance between the level of security and usability. In order to fill this gap, we propose a design for a local security mechanism for mobile devices by using an reasonable combination of existing technologies.

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