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Paper Abstract and Keywords
Presentation 2010-05-21 14:15
Comparing with feature of quantum stream cipher Y-00 and CPPM -- Cipher with randomization of chiphertext --
Masaki Sohma, Osamu Hirota (Tamagawa Univ.) ISEC2010-4
Abstract (in Japanese) (See Japanese page) 
(in English) The basis of the information theoretic security of the symmetric ky cipher is based on the Shannon theory published in 1949. The security against the ciphertext only attack on data has the Shannon limit:$H(X|Y)\le H(K)$, and one needs one time pad to realize the perfect secrecy. From the research for breaking the limit,so called Y-00 protocol has been proposed, which has a potential to break it.
Since all parameter of Y-00 is the finite, still the complete analysis has difficulty. On the other hand, a new scheme so called CPPM(coherent pulse position modulation) that allow the asymptotic analysis for some parameters has been also proposed.
It is easy to understand by CPPM how the Shannon limit is broken. In this paper, we clarify the concrete feature of CPPM comparing with Y-00.
Keyword (in Japanese) (See Japanese page) 
(in English) Random cipher / Optical quantum cipher / Y-00 / Quantum stream cipher / Shannon limit / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 44, ISEC2010-4, pp. 17-24, May 2010.
Paper # ISEC2010-4 
Date of Issue 2010-05-14 (ISEC) 
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 ISEC2010-4

Conference Information
Committee ISEC  
Conference Date 2010-05-21 - 2010-05-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2010-05-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Comparing with feature of quantum stream cipher Y-00 and CPPM 
Sub Title (in English) Cipher with randomization of chiphertext 
Keyword(1) Random cipher  
Keyword(2) Optical quantum cipher  
Keyword(3) Y-00  
Keyword(4) Quantum stream cipher  
Keyword(5) Shannon limit  
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Keyword(7)  
Keyword(8)  
1st Author's Name Masaki Sohma  
1st Author's Affiliation Tamagawa University (Tamagawa Univ.)
2nd Author's Name Osamu Hirota  
2nd Author's Affiliation Tamagawa University (Tamagawa Univ.)
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Speaker Author-1 
Date Time 2010-05-21 14:15:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2010-4 
Volume (vol) vol.110 
Number (no) no.44 
Page pp.17-24 
#Pages 8 
Date of Issue 2010-05-14 (ISEC) 

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