[HGI-News] HGI-Seminar 12.12.2005 (Miniseminar Contributory Group Key Agreement Protocols for Mobile Ad Hoc Groups, part 2)

[Newsletter des Horst Görtz Instituts]

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                               HGI Seminar
           Zweiteiliges Miniseminar -- Mini-Seminar in two parts
Contributory Group Key Agreement Protocols for Mobile Ad Hoc Groups

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                          Part 2 - Zweiter Teil

                               Mark Manulis
                           Ruhr-University Bochum

                   Montag, 12.12.2005, 13:15 Uhr, IC 4/30


             Key Agreement in Heterogeneous Mobile Ad Hoc Groups


Abstract: Security of various group-oriented applications for mobile
ad-hoc groups requires a group secret shared between all participants.
Contributory group key agreement (CGKA) protocols, originally designed
for dynamic peer groups in local- and wide-area wired networks, can be
adopted to mobile ad-hoc scenarios because of the similar security
requirements and trust relationship between participants. Essential is
the absence of any trusted central authority (e.g., a group manager)
that actively participates in the computation of the group key. Members
of spontaneously formed mobile ad-hoc groups are usually equipped with
different kinds of mobile devices, e.g., laptops, PDAs, and mobile
phones. Considering performance capabilities of the involved mobile
devices we distinguish between homogeneous and heterogeneous mobile
ad-hoc groups. On one hand heterogeneity opens a new way of designing
the CGKA protocols considering performance of the devices, on the other
hand it states additional security requirements as shown throughout
this paper. We propose a first CGKA protocol for heterogeneous mobile
ad hoc groups that fulfills not only common security requirements for
CGKA protocols but also additional requirements specified by our model.
The main idea behind our protocol is a fair distribution of costs
between mobile devices according to their performance capabilities. Our
protocols are based on elliptic curve cryptography (ECC) to achieve
computation and communication efficiency.

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The first part was: - Der erste Teil war:

Lijun Liao - Ruhr-University Bochum
TFAN: Tree-based Group Key Agreement Framework for Mobile Ad-Hoc  
Networks
Montag, 05.12.2005, 13:15 Uhr, IC 4/30


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Nächste Termine im Jahre 2005 - Next talks in the Year 2005

19.12.2005  Thomas Dullien.  Attacks on unitialized local variables.


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Organisation:
Prof. Dr. Roberto Avanzi
Faculty for Mathematics
Ruhr-University Bochum
44780 Bochum, Germany

URL:   http://www.cits.rub.de
          http://www.rub.de/hgi


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