[HGI-News] HGI-Seminar am Montag, 14.06.2004

[hgi-news at lists.ruhr-uni-bochum.de]

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			   Kerstin Lemke
			  COSY Group - RUB
		 
            	  
        "DPA on n-bit sized Boolean and Arithmetic Operations and 	
	   its application to IDEA, RC6 and the HMAC-Construction"



             Montag, 14.06.2004, 13:15 hrs, IC 4/39

Abstract

Differential Power Analysis (DPA) has turned out to be an efficient  method
to attack the implementations of cryptographic algorithms and has  been well
studied for ciphers that incorporate a nonlinear substitution  box as e.g.
in DES. Other product ciphers and message authentication  codes are based on
the mixing of different algebraic groups and do not  use look-up tables.
Among these are IDEA, the AES finalist RC6 and  HMAC-constructions such as
HMAC-SHA-1 and HMAC-RIPEMD-160. These  algorithms restrict the use of the
selection function to the Hamming  weight and Hamming distance of
intermediate data as the addresses used  do not depend on cryptographic
keys. Because of the linearity of the  primitive operations secondary DPA
signals arise.
 
This presentation gives a deeper analysis of the characteristics of DPA
results obtained on the basic group operations XOR, addition modulo  $2^n$
and modular multiplication using multi-bit selection functions.   The
results shown are based both on simulation and experimental data. 
 





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VORTRÄGE IM SS 2004:
(Abstracts sind hier:
 www.crypto.ruhr-uni-bochum.de/Seminare/Krypt/Kryptosose04.htm)

 
 19.04.2004, Marc Stevens, ITSC - RUB, 13.00 c.t. IC 4/39,,
 "Arithmetic on Hyperelliptic curves of genus 1 and 2"

 26.04.2004, Jonathan Hammell, COSY - RUB, 13.00 c.t. IC 4/39,
 "Recognition in a Low-Power Environment"

 03.05.2004, Kai Schramm, COSY - RUB, 13.00 c.t. IC 4/39,
 "Internal Collisions in AES"

 17.05 Christian Tobias, JLU Gießen, 13.15 hrs. IC 4/39,
 "Design und Analyse kryptografischer Bausteine auf nicht-abelschen
Gruppen"

 24.05 Jamshid Shokrollahi, Uni Paderborn, 13.15 hrs. IC 4/39,
 "Unifying structures for polynomial and normal bases"

 31.05 no seminar (Holiday: Pfingsmontag)

 7.06 Lars Pontow, COSY Group -RUB, 13:15 hrs. IC 4/39,
 "Elliptic Curve Cryptography as a Case Study for Hardware/Software
Codesign"

 14.06 Kerstin Lemke, COSY Group -RUB, 13.15 hrs. IC 4/39,
 "DPA on n-bit sized Boolean and Arithmetic Operations and its
application to IDEA, RC6 and the HMAC-Construction"

 16.06 Eike Kiltz, Lehrstuhl Mathematik und Informatik -RUB, 13:30 hrs.  NA
1/58 (Friedrich-Sommer Raum)
"Secure Constant Round Multi-Party Computation for Equality, Comparison  and
Bits"

 21.06 Howon Kim, COSY Group -RUB, 13.15 hrs. IC 4/39,
 "TBA"

 28.06 TBA

 5.07 Mark Manulis, NDS Group -RUB, 13:15 hrs. IC 4/39,
 "Pseudonym Generation Scheme for Ad-Hoc Group Communication based on   IDH"


 12.07 TBA

 19.07 TBA

 26.07 TBA



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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