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| Presentation | 2018-03-08 11:40 Constructions of the (3,n) and (4,n) Threshold Visual Cryptography Using Combinatorial Designs and Their Performance Evaluation Kotaro Okada, Hiroki Koga (Univ. of Tsukuba)  IT2017-109 ISEC2017-97 WBS2017-90 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | A $(t,n)$-threshold visual cryptography scheme ($(t,n)$-VCS) is a kind of secret sharing schemes for digital images. In this scheme, a secret image is encoded to $n$ shares and is recovered from superimposition of arbitrary $t$ shares, while no information on a secret image is revealed from any collection of less than $t$ shares. In several previous studies, the structures called block designs appear as the results of optimization of the $(t,n)$-VCS. In this study, we focus on this connection between the VCS and block designs and propose constructions of the $(3,n)$ and $(4,n)$-VCS using the incident matrices of block designs. We also discuss the conditions for the block designs under which the relative differences of the obtained $(3,n)$ and $(4,n)$-VCS are maximized. We compare the maximized optimal relative differences with the optimal relative differences obtained by using a linear programming scheme. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | visual cryptography scheme / $(t,n)$-VCS / block design / BIBD / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 117, no. 487, IT2017-109, pp. 37-42, March 2018. | |
| Paper # | IT2017-109 | |
| Date of Issue | 2018-03-01 (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) | |
| Download PDF | IT2017-109 ISEC2017-97 WBS2017-90 |
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| Conference Information | |
| Committee | WBS IT ISEC |
| Conference Date | 2018-03-08 - 2018-03-09 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Katsusika Campas, Tokyo University of Science |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | joint meeting of IT, ISEC, and WBS |
| Paper Information | |
| Registration To | IT |
| Conference Code | 2018-03-WBS-IT-ISEC |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Constructions of the (3,n) and (4,n) Threshold Visual Cryptography Using Combinatorial Designs and Their Performance Evaluation |
| Sub Title (in English) | |
| Keyword(1) | visual cryptography scheme |
| Keyword(2) | $(t,n)$-VCS |
| Keyword(3) | block design |
| Keyword(4) | BIBD |
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| 1st Author's Name | Kotaro Okada |
| 1st Author's Affiliation | University of Tsukuba (Univ. of Tsukuba) |
| 2nd Author's Name | Hiroki Koga |
| 2nd Author's Affiliation | University of Tsukuba (Univ. of Tsukuba) |
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| Speaker | Author-1 |
| Date Time | 2018-03-08 11:40:00 |
| Presentation Time | 25 minutes |
| Registration for | IT |
| Paper # | IT2017-109, ISEC2017-97, WBS2017-90 |
| Volume (vol) | vol.117 |
| Number (no) | no.487(IT), no.488(ISEC), no.489(WBS) |
| Page | pp.37-42 |
| #Pages | 6 |
| Date of Issue | 2018-03-01 (IT, ISEC, WBS) |
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