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Auflistung nach Autor:in "Steffan, Jan"

1 - 2 von 2
  • Konferenzbeitrag
    Active data protection with data journals
    (INFORMATIK 2003 - Mit Sicherheit Informatik, Schwerpunkt "Sicherheit - Schutz und Zuverlässigkeit", 2003) Brückner, Lars; Steffan, Jan; Terpstra, Wesley; Wilhelm, Uwe
    A major privacy problem on the internet is the unrestricted sharing of user data between services and other parties. The EU privacy legislation grants the user the rights to restrict the dissemination of his personal data, but users often simply do not know which kind of data was collected by these services. In this paper we propose data journals as a new kind of privacy enhancement technology to increase the user's ability to take advantage of his rights. A data journal is a tool that records the disclosure of personal data to services and collects related information about the service provider's identity and its privacy policy. We describe how data journals work, how the user can benefit from their usage, and their relation to other privacy enhancement technologies. Two prototype implementations show that data journals can be implemented on without changes to existing services or big changes of the user's browsing experience.
  • Konferenzbeitrag
    Security mechanisms for multi-purpose sensor networks
    (Informatik 2005 – Informatik Live! Band 2, 2005) Steffan, Jan; Voss, Marco
    Multi-purpose sensor networks provide an infrastructure that is shared by multiple parties for the execution of concurrent tasks. This setting has direct implications for security: Access to certain sensor nodes and visibility of sensor data has to be restricted to the authorized party. We extend our earlier work on scope based group management for wireless sensor networks with cryptographic mechanisms that meet those requirements under the given constraints1.