Paper Abstract and Keywords |
Presentation |
2009-03-10 11:15
Bit Slice Cryptanalysis of Simplified K2 Stream Cipher Takashi Ohshima, Munetoshi Iwakiri (National Defense Academy) IT2008-83 ISEC2008-141 WBS2008-96 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
K2 is a stream cipher based on 32 bits LFSR, outputs 64 bits random number sequences with 128 bits secret key at every process cycle. In this study, we modified the K2 algorithm as eliminate the substitution and the permutation process blocks at first, and applied bit slice cryptanalysis to its simplified K2. Bit slice cryptanalysis divides cypher stream sequence by a bitplane for easy decipher with the Guess-and-Determine attack. In addition, the proposed method extend the estimated bit slices to upper bit planes with full adder and LFSR control procedures of K2 algorithm, decrypt the 32bits registers and the other parameters. Experimental result demonstrated all internal parameters for the simplified K2 algorithm were analyzed in polynomial time. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Stream Cipher / K2 / Bit Slice Cryptanalysis / Guess-and-Determine Attack / / / / |
Reference Info. |
IEICE Tech. Rep., vol. 108, no. 473, ISEC2008-141, pp. 253-258, March 2009. |
Paper # |
ISEC2008-141 |
Date of Issue |
2009-03-02 (IT, ISEC, WBS) |
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) |
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IT2008-83 ISEC2008-141 WBS2008-96 |
Conference Information |
Committee |
WBS IT ISEC |
Conference Date |
2009-03-09 - 2009-03-10 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Hakodate Mirai Univ. |
Topics (in Japanese) |
(See Japanese page) |
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Paper Information |
Registration To |
ISEC |
Conference Code |
2009-03-WBS-IT-ISEC |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
Bit Slice Cryptanalysis of Simplified K2 Stream Cipher |
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Stream Cipher |
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K2 |
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Bit Slice Cryptanalysis |
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Guess-and-Determine Attack |
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1st Author's Name |
Takashi Ohshima |
1st Author's Affiliation |
National Defense Academy (National Defense Academy) |
2nd Author's Name |
Munetoshi Iwakiri |
2nd Author's Affiliation |
National Defense Academy (National Defense Academy) |
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Speaker |
Author-1 |
Date Time |
2009-03-10 11:15:00 |
Presentation Time |
25 minutes |
Registration for |
ISEC |
Paper # |
IT2008-83, ISEC2008-141, WBS2008-96 |
Volume (vol) |
vol.108 |
Number (no) |
no.472(IT), no.473(ISEC), no.474(WBS) |
Page |
pp.253-258 |
#Pages |
6 |
Date of Issue |
2009-03-02 (IT, ISEC, WBS) |
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