APSIPA Transactions on Signal and Information Processing > Vol 8 > Issue 1

Decentralized tracing protocol for fingerprinting system

Minoru Kuribayashi, Okayama University, Japan, kminoru@okayama-u.ac.jp , Nobuo Funabiki, Okayama University, Japan
 
Suggested Citation
Minoru Kuribayashi and Nobuo Funabiki (2019), "Decentralized tracing protocol for fingerprinting system", APSIPA Transactions on Signal and Information Processing: Vol. 8: No. 1, e2. http://dx.doi.org/10.1017/ATSIP.2018.28

Publication Date: 09 Jan 2019
© 2019 Minoru Kuribayashi and Nobuo Funabiki
 
Subjects
 
Keywords
FingerprintingCollusion attackTracing traitorHomomorphic encryption
 

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This is published under the terms of the Creative Commons Attribution licence.

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In this article:
I. INTRODUCTION 
II. PRELIMINARIES 
III. DECENTRALIZED TRACING PROTOCOL 
IV. SECURITY ANALYSIS 
V. EXPERIMENTAL RESULTS 
VI. TOWARD OPTIMAL SCORING FUNCTION 
VII. CONCLUSION 

Abstract

In conventional studies, cryptographic techniques are used to ensure the security of transaction between a seller and buyer in a fingerprinting system. However, the tracing protocol from a pirated copy has not been studied from the security point of view though the collusion resistance is considered by employing a collusion secure fingerprinting code. In this paper, we consider the secrecy of parameters for a fingerprinting code and burdens at a trusted center, and propose a secure tracing protocol jointly executed by a seller and a delegated server. Our main idea is to delegate authority to a server so that the center is required to operate only at the initialization phase in the system. When a pirated copy is found, a seller calculates a correlation score for each user's codeword in an encrypted domain, and identifies illegal users by sending the ciphertexts of scores as queries to the server. The information leakage from the server can be managed at the restriction of response from the server to check the maliciousness of the queries.

DOI:10.1017/ATSIP.2018.28