[HGI-News] HGI-Seminar am Montag, 19.01.2004, 13:00 ct

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

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                    Stefan Lucks
            	 Universität Mannheim


     	"Practice and Theory of Related-Key Attacks"

         Montag, 19.01.2004, 13:00 c.t, IC 4/39

Abstract

The "classical" attack scenarios for block ciphers allow the adversary  to
choose plaintexts and ask for ciphertexts, or additionally to choose
ciphertexts and request plaintexts. "Related-key" attacks give the
adversary the additional power to manipulate the secret key. Two  practical
reasons to study related-key attacks are:

1. Related key attacks have been found useful to evaluate the security  of
block ciphers (e.g. in the context of the AES-process).

2. Some cryptographic protocols actually allow the adversary to mount a
related-key attack against an underlying block cipher. Thus, the  security
of the protocol can depend on the block cipher's related-key  security.

The talk gives examples for related-key attacks against block ciphers  and
protocols. Also, it presents new theoretical constructions for  ciphers
provably secure against related-key attacks.



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VORTRÄGE IM WS 2003/04:
(Abstracts sind hier:
 www.crypto.ruhr-uni-bochum.de/Seminare/Krypt/Kryptowise0304.html)

 10.11.2003 Yvo Desmedt, Florida State University, USA, 13.00 c.t. IC  4/39
 Cryptanalysis of Several of the UCLA Watermarking Schemes for  Intellectual
Property Protection of Digital Circuits/Designs

 01.12.2003 Christof Paar, COSY Group - RUB, 13.00 c.t. IC 4/39
 Eingebettete IT-Sicherheit im Automobil

 08.12.2003, Ammar Alkassar, Uni Saarland, 13.00 c.t. IC 4/39,
 "Secure Object Identification - Or: How To Solve The
Chess-Grandmaster-Problem"

 15.12.2003, Philippe Rivard, COSY Group -RUB, 13.00 c.t. IC 4/39,
 "Light-weight embedded SSL"

 12.01.2004, Sandeep Kumar, COSY Group -RUB, 13.0 c.t. IC 4/39,
 "Embedded End-to-End Wireless Security with ECDH Key Exchange"

 19.01.2004, Stefan Lucks, Uni. Mannheim, 13.00 c.t.,
 "Practice and Theory of Related-Key Attacks"

 26.01.2004, Johannes Ueberberg, SRC GmbH, 13.00 c.t.,
 "Sichere Zahlungsverkehrsmodelle im Internet"

 02.02.2004, Klaus Milczewsky, T-Online International AG, 13.00 c.t.,
 TBA

 09.02.2004, Roger Oyon, Uni. Essen, 13.00 c.t.,
 "Fast Arithmetic on Jacobians of Picard Curves"

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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