[HGI-News] HGI Seminar, Montag,11.07.

[Newsletter des Horst Görtz Instituts]

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                              Kerstin Lemke 
                 Lehrstuhl für Kommunikationssicherheit	
                         Ruhr-Universität Bochum

   "A Stochastic Model for Differential Side Channel Cryptanalysis"



                  Montag, 11.07.2005, 13:15 Uhr, IC 4/39,


Abstract

This talk presents a new approach to optimize the efficiency of differential
side channel cryptanalysis against block ciphers by advanced stochastic
methods. We approximate the real leakage function within a suitable vector
subspace so that under appropriate conditions profiling requires only one
test key. For the key extraction we present a `minimum principle' that
solely uses deterministic data dependencies and the `maximum likelihood
principle' that additionally incorporates the characterization of the noise
revealed during profiling. The theoretical predictions are accompanied and
confirmed by experiments. We demonstrate that the adaptation of probability
densities is clearly advantageous regarding the correlation method,
especially, if multiple leakage signals at different times can be jointly
evaluated. Though our efficiency at key extraction is limited by template
attacks profiling is much more efficient which is highly relevant if the
designer of a cryptosystem is bounded by the number of measurements in the
profiling step.   


 
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ANFAHRT: Eine Wegbeschreibung zum IC Gebäude der RUB ist hier zu finden:
http://www.crypto.ruhr-uni-bochum.de/contact.html

VORTRÄGE IM SS 2005:
(Abstracts sind hier:
 http://www.crypto.ruhr-uni-bochum.de/hgi_sose05.html)

25.04 Marcel Holtmann, 13.15 hrs. IC 4/39,
"Bluetooth Security Unleashed"

02.05 Jan Pelzl, COSY - RUB, 13.15 hrs. IC 4/39,
"Hardware-based Factorization of Integers with the Elliptic Curve Method"

09.05 Michael Schmidt, University of Siegen, 13.15 hrs. IC 4/39,
"Subscriptionless Mobile Networking - A Secure, Privacy-Preserving Ad-hoc
Service Architecture"
 
23.05 Dario Carluccio, COSY - RUB, 13.15 hrs. IC 4/39,
"Electromagnetic Side Channel Analysis for Embedded Crypto Devices"

30.05 Thomas Dullien, RUB, 13.15 hrs. IC 4/39
"Structural Comparison of Executable Objects"

06.06 Stefan Strobel, cirosec GmbH, 13.15 hrs. IC 4/39,
"Sicherheit von Web-Applikation und E-Business-Systemen"

13.06 Marco Macchetti, Politecnico di Milano, 13.15 hrs. IC 4/39,
"Efficient Approaches for Hardware S-box DPA Resistance: a Proposal"

20.06 Selcuk Baktir, CRIS, WPI (USA), 13:15 hrs. IC 4/39,
"Finite Field Polynomial Multiplication in the Frequency Domain with 
Application to Elliptic Curve Cryptography"

27.06  Andrey Bogdanov, IEM, Uni Duisburg-Essen, 13:15 hrs. IC 4/39,
"ABC: A Family of Fast Stream Ciphers"

04.07  Björn Fay, Justus Liebig-Uni Giessen, 13.15 hrs. IC 4/39,
"Anwendung und Sicherheit der Random-Oracle Methode"

11.07  Kerstin Lemke, COSY - RUB, 13:15 hrs. IC 4/39
"A Stochastic Model for Differential Side Channel Cryptanalysis"

18.07  Philipp Südmeyer, COSY - RUB, 13.15 hrs. IC 4/39,
TBA

25.07  Jens-Peter Kaps, CRIS, WPI (USA), 13:15 hrs. IC 4/39,
"Cryptography for Ultra-Low Power Devices, Securing Pervasive Computing"


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M.Tech. Sandeep Kumar
Chair for Communication Security
Dept. of Electr. Eng. & Information Sciences
Ruhr-University Bochum
44780 Bochum, Germany

URL: www.crypto.rub.de