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iNetSec 2009-Open Research Problems in Network Security. IFIP WG 11.4 International Workshop, Zurich, Switzerland, April 23-24, 2009, Revised Selected Papers
No full textTowards Usable Interfaces for Proof Based Access Rights on Mobile Devices
No full textAccess rights management is in the middle of many collaboration forms such as group formation or sharing of information in different kinds of scenarios. There are some strong mechanisms to achieve this, like anonymous credential systems. However in general their usage is not very intuitive for lay users. In this paper we show the potential of using proof-based credential systems like Idemix to enhance the usability of privacy-respecting social interaction in different collaborative settings. For instance transparently performing authorization without any user intervention at the level of the user interface becomes possible. In order to improve the usability, we complement this by introducing a mental model for intuitive management of digital identities. The approach should also empower users to define their own access restrictions when sharing data, by building custom proof specifications on the fly. We show this exemplary with a developed prototype application for supporting collaborative scenarios on a mobile device. We also present first evaluation results of an early prototype and address current as well as future work
Discussing Anonymity Metrics for Mix Based Anonymity Approaches
Full text linkToday the Chaumian Mix idea is not only an academic approach for anonymous communication, it is also a practical system with many variants used in real-world scenarios. It is therefore important to find an appropriate measure for the anonymity provided by these approaches. Many measurement approaches have been proposed that consider only the static state of the system without accounting for past and future information. Still other measurements evaluate only statistics. These measurements have in common that they do not measure when the anonymity function of the system is broken. Inspired by the idea of unicity distance in cryptography, and the mean time to failure in dependable systems, we believe that measuring the point at which the system fails to hide the relation between a sender and a receiver is a more appropriate measure of its anonymity. In this paper, we discuss our arguments with respect to existing measurement approaches
Architectural Considerations Increasing Privacy in Mobile Communication Systems (short presentation)
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