Talks and Poster Presentations (with Proceedings-Entry):

G. Starnberger, L. Froihofer, K. Göschka:
"Distributed Timestamping with Smart Cards using Efficient Overlay Routing";
Talk: 5th International Conference for Internet Technology and Secured Transactions (ICITST-2010), London, UK; 2010-11-08 - 2010-11-11; in: "Proceedings of the 5th International Conference for Internet Technology and Secured Transactions (ICITST-2010)", C. Shoniregun, G. Akmayeva (ed.); ICITST-10 published by Infonomics Society, UK, (2010), ISBN: 978-0-9564263-6-9; 257 - 262.

English abstract:
A secure digital timestamp can assert the existence of
a particular document at a specific point in time. While
centralized timestamp servers show dependability drawbacks
with respect to node or link failures, e.g., outages
of the Internet connectivity, distributed timestamping protocols
don´t have these drawbacks, but are nowadays rarely
seen in practice because of the distributed trust requirements
and applicability issues.
In this paper, we contribute with: (i) A distributed timestamp
protocol addressing practical applicability issues
with an efficient overlay routing architecture able to minimize
the effects of node churn and connection establishment
delays, at the cost of higher impacts of hop-to-hop latencies,
(ii) Smart card integration to introduce a distributed web of
trust and hence increase the security of applied timestamps,
and (iii) An evaluation using a prototype implementation
and network simulation that shows the performance gains
of our protocol in comparison to the state-of-the-art.
The properties of our protocol allow for its application
in scenarios where distributed timestamping protocols have
not been an option so far, for example, because of mutually
distrusting users. Furthermore, while many existing distributed
timestamping protocols are only theoretically evaluated,
we show the feasibility of our protocol with a prototype

Related Projects:
Project Head Karl Michael Göschka:

Created from the Publication Database of the Vienna University of Technology.