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Paper Abstract and Keywords
Presentation 2007-09-07 10:15
visual cryptography schemes with tree access structure for many images
Miyuki Uno, Mikio Kano (Ibaraki Univ.) ISEC2007-77
Abstract (in Japanese) (See Japanese page) 
(in English) Let $T$ be a tree with order $n$ and maximum degree three.
We construct a
visual cryptography sharing scheme with $T$ access structure
for $n-1$ secret images and $n$ shares,
where each vertex and each edge of $T$
correspond to a share and a secret image,
respectively, and two shares corresponding to two adjacent vertices of $T$
decode the secret image corresponding to the edge joining them.
This secret sharing scheme can be constructed by using
Droste's method. However the contrast of its scheme is $1/(2(n-1))$.
In this paper, a new construction of such a secret sharing scheme
with contrast $1/6$ for all $n$ is given.
It is also shown that this contrast is sharp in some sense.
Keyword (in Japanese) (See Japanese page) 
(in English) visual cryptography / VCS / visual secret sharing / VSS / VCS for many secret images / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 209, ISEC2007-77, pp. 25-31, Sept. 2007.
Paper # ISEC2007-77 
Date of Issue 2007-08-31 (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 ISEC2007-77

Conference Information
Committee ISEC  
Conference Date 2007-09-07 - 2007-09-07 
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 2007-09-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) visual cryptography schemes with tree access structure for many images 
Sub Title (in English)  
Keyword(1) visual cryptography  
Keyword(2) VCS  
Keyword(3) visual secret sharing  
Keyword(4) VSS  
Keyword(5) VCS for many secret images  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Miyuki Uno  
1st Author's Affiliation Ibaraki University (Ibaraki Univ.)
2nd Author's Name Mikio Kano  
2nd Author's Affiliation Ibaraki University (Ibaraki Univ.)
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Speaker Author-1 
Date Time 2007-09-07 10:15:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2007-77 
Volume (vol) vol.107 
Number (no) no.209 
Page pp.25-31 
#Pages 7 
Date of Issue 2007-08-31 (ISEC) 

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