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Paper Abstract and Keywords
Presentation 2018-03-05 14:35
[Poster Presentation] Estimation of Collusion Strategy for Fingerprinting Codes
Tatsuya Yasui, Minoru Kuribayashi, Nobuo Funabiki (Okayama Univ.) EMM2017-80
Abstract (in Japanese) (See Japanese page) 
(in English) An optimal detector is known as MAP detector has been proposed for the probabilistic fingerprinting codes such as Tardos and Nuida codes.
It calculates the correlation score between each user's codeword and a pirated codeword, and judges the user as guilty whose score exceeds a threshold.
However, it needs two kinds of important information. One is the collusion strategy which is used at the generation of a pirated codeword from colluders' codewords, and the other is the number of colluders.
In this study, in order to calculate an optimal score, we propose an estimator which outputs these two parameters from a pirated codeword.
At the estimation of collusion strategy, we measure the bias in the pirated codeword by observing the number of symbols "0" and "1", and compare with some bias patterns possible collusion strategies.
For the estimation of number of colluders, we serch the closest strategy from all patterns with combination of collusion strategy and number of colluders.
As a result of computer simulations, collusion strategy can be estimated with high probability. In addition, it is revealed that the traceability of the detector using the proposed estimator is extremely close to the optimal detector.
Keyword (in Japanese) (See Japanese page) 
(in English) fingerprinting code / optimal detector / collusion strategy / number of colluders / estimator / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 476, EMM2017-80, pp. 17-22, March 2018.
Paper # EMM2017-80 
Date of Issue 2018-02-26 (EMM) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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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Conference Information
Committee EMM  
Conference Date 2018-03-05 - 2018-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Naze Community Center (Amami-Shi, Kagoshima) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Image and Sound Quality, Metrics for Perception and Recognition, Human Auditory and Visual System, etc. 
Paper Information
Registration To EMM 
Conference Code 2018-03-EMM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Estimation of Collusion Strategy for Fingerprinting Codes 
Sub Title (in English)  
Keyword(1) fingerprinting code  
Keyword(2) optimal detector  
Keyword(3) collusion strategy  
Keyword(4) number of colluders  
Keyword(5) estimator  
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1st Author's Name Tatsuya Yasui  
1st Author's Affiliation Okayama University (Okayama Univ.)
2nd Author's Name Minoru Kuribayashi  
2nd Author's Affiliation Okayama University (Okayama Univ.)
3rd Author's Name Nobuo Funabiki  
3rd Author's Affiliation Okayama University (Okayama Univ.)
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Speaker Author-1 
Date Time 2018-03-05 14:35:00 
Presentation Time 60 minutes 
Registration for EMM 
Paper # EMM2017-80 
Volume (vol) vol.117 
Number (no) no.476 
Page pp.17-22 
#Pages
Date of Issue 2018-02-26 (EMM) 


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