An improved distinguisher for dragon

Cho, Joo Yeon & Pieprzyk, Josef (2008) An improved distinguisher for dragon. In Li, Yongqing, Ling, San, Niederreiter, Harald, Wang, Huaxiong, Xing, Chaoping, & Zhang, Shengyuan (Eds.) Proceedings of the First International Workshop on Coding and Cryptology, World Scientific Publishing, Wuyi Mountain, Fujian, China, pp. 91-108.

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Abstract

Dragon stream cipher is one of the focus ciphers which have reached Phase 2 of the eSTREAMproject. In this paper, we present a new method of building a linear distinguisher for Dragon. The distinguisher is constructed by exploiting the biases of two S-boxes and the modular addition which are basic components of the nonlinear function F. The bias of the distinguisher is estimated to be around 2−75.32 which is better than the bias of the distinguisher presented by Englund and Maximov. We have shown that Dragon is distinguishable from a random cipher by using around 2150.6 keystream words and 259 memory. In addition, we present a very efficient algorithm for computing the bias of linear approximation of modular addition.

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ID Code: 70254
Item Type: Conference Paper
Refereed: Yes
Additional Information: Series on Coding Theory and Cryptology : Volume 4, Coding and Cryptology
Keywords: Stream Ciphers, eSTREAM, Dragon, Modular Addition
DOI: 10.1142/9789812832245_0007
ISBN: 9789814470599
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 by World Scientific Publishing Co. Pte. Ltd.
Copyright Statement: All rights reserved. This book, or parts thereof, may not be reproduced in any form or by any means, electronic or mechanical, including photocopying, recording or any information storage and retrieval system now known or to be invented, without written permission from the Publisher.
Deposited On: 16 Apr 2014 02:31
Last Modified: 29 Apr 2014 12:51

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