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Paper Abstract and Keywords
Presentation 2012-05-18 13:25
Incompleteness of the criterion for information theoretically key agreement
Osamu Hirota (Tamagawa Univ.) ISEC2012-2
Abstract (in Japanese) (See Japanese page) 
(in English) Despite theoretical haughty claim on the security of quantum key distribution (QKD), even the security for the basic model of the QKD is still not established rigorously. One of the main problems is that the inadequate criteria are applied to the generated key in QKD. The current theory of the security of QKD is based on the trace distance by Renner. This idea comes from the indistinguishability theory in the mathematical cipher. In any criterion, when it is zero, there is no problem. However, it becomes non-zero at least when the system parameters are finite an essential requirement for the realization of the system. When the criteria are not zero, one needs operational meaning of the criteria in cryptography. So far, H.P.Yuen has warned the QKD community in the light of a new formulation which shows that information theoretic security cannot be guaranteed by a single criterion such as the trace distance. In this talk, we introduce the correct evaluation of QKD by H.P.Yuen, and explain that any BB-84 QKD system cannot provide the crypto-system with unconditional security in a real situation. As examples, we show that QKD systems analyzed by Tamaki (NTT) and Tsurumaru (Mitsubishi) have meaningless security. In addition, we point out that the key rate of NEC system becomes minus when the leak of error correction code is included.
These show that QKD is currently untenable in both theory and practice, contrary to the claims of many.
Keyword (in Japanese) (See Japanese page) 
(in English) Information theoretic security / quantum key distribution / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 39, ISEC2012-2, pp. 5-10, May 2012.
Paper # ISEC2012-2 
Date of Issue 2012-05-11 (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 ISEC2012-2

Conference Information
Committee ISEC  
Conference Date 2012-05-18 - 2012-05-18 
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 2012-05-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Incompleteness of the criterion for information theoretically key agreement 
Sub Title (in English)  
Keyword(1) Information theoretic security  
Keyword(2) quantum key distribution  
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1st Author's Name Osamu Hirota  
1st Author's Affiliation Tamagawa University (Tamagawa Univ.)
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Speaker Author-1 
Date Time 2012-05-18 13:25:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2012-2 
Volume (vol) vol.112 
Number (no) no.39 
Page pp.5-10 
#Pages 6 
Date of Issue 2012-05-11 (ISEC) 

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