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Paper Abstract and Keywords
Presentation 2007-11-22 15:20
A Key Recovery Attack on WEP with Less Packets
Toshihiro Ohigashi, Hidenori Kuwakado, Masakatu Morii (Kobe Univ.) ISEC2007-109 OIS2007-81
Abstract (in Japanese) (See Japanese page) 
(in English) E. Tews, R. Weinmann, and A. Pyshkin have recently shown a key recovery attack on WEP (called the PTW attack). The PTW attack recovers a 104-bit secret key from the first 15 bytes of a keystream, which is obtained from the output of WEP. It recovers the secret key with a probability of 0.5 when 40,000 packets are given, or with a probability of 0.95 when 85,000 packets are given. Their attack is one of the most effective attack on WEP. This paper proposes a key recovery attack, which uses
the first 30 bytes of the keystream. In order to use the 16-30th bytes of the keystream for the attack, we give two processes. Our attack halves the number of packets for similar probability that the 104-bit secret key is recovered by the PTW attack. In particular, our attack can recover the secret key with a non-negligible probability when the number of packets is small, for example, 5,000, 7,500, or 10,000. Therefore, even low-traffic communication on WEP allows an attacker to recover a secret key.
Keyword (in Japanese) (See Japanese page) 
(in English) cryptanalysis / key recovery attack / stream cipher / RC4 / WEP / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 346, ISEC2007-109, pp. 61-68, Nov. 2007.
Paper # ISEC2007-109 
Date of Issue 2007-11-15 (ISEC, OIS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF ISEC2007-109 OIS2007-81

Conference Information
Committee ISEC LOIS  
Conference Date 2007-11-21 - 2007-11-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Kobe University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2007-11-ISEC-OIS 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Key Recovery Attack on WEP with Less Packets 
Sub Title (in English)  
Keyword(1) cryptanalysis  
Keyword(2) key recovery attack  
Keyword(3) stream cipher  
Keyword(4) RC4  
Keyword(5) WEP  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Toshihiro Ohigashi  
1st Author's Affiliation Kobe University (Kobe Univ.)
2nd Author's Name Hidenori Kuwakado  
2nd Author's Affiliation Kobe University (Kobe Univ.)
3rd Author's Name Masakatu Morii  
3rd Author's Affiliation Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2007-11-22 15:20:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2007-109, OIS2007-81 
Volume (vol) vol.107 
Number (no) no.346(ISEC), no.348(OIS) 
Page pp.61-68 
#Pages 8 
Date of Issue 2007-11-15 (ISEC, OIS) 

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