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2020 | OriginalPaper | Buchkapitel

Watermarkable Signature with Computational Function Preserving

verfasst von : Kyohei Sudo, Masayuki Tezuka, Keisuke Hara, Yusuke Yoshida, Keisuke Tanaka

Erschienen in: Provable and Practical Security

Verlag: Springer International Publishing

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Abstract

Software watermarking enables one to embed some information called “mark” into a program while preserving its functionality, and to read it from the program. As a definition of function preserving, Cohen et al. (STOC 2016) proposed statistical function preserving which requires that the input/output behavior of the marked circuit is identical almost everywhere to that of the original unmarked circuit. They showed how to construct watermarkable cryptographic primitives with statistical function preserving, including pseudorandom functions (PRFs) and public-key encryption from indistinguishability obfuscation. Recently, Goyal et al. (CRYPTO 2019) introduced more relaxed definition of function preserving for watermarkable signature. Watermarkable signature embeds a mark into a signing circuit of digital signature. The relaxed function preserving only requires that the marked signing circuit outputs valid signatures. They provide watermarkable signature with the relaxed function preserving only based on (standard) digital signature.

In this work, we introduce an intermediate notion of function preserving for watermarkable signature, which is called computational function preserving. Then, we examine the relationship among our computational function preserving, relaxed function preserving by Goyal et al., and statistical function preserving by Cohen et al. Furthermore, we propose a generic construction of watermarkable signature scheme satisfying computational function preserving based on public key encryption and (standard) digital signature.

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Vorheriges Kapitel One-Time Delegation of Unlinkable Signing Rights and Its Application

Nächstes Kapitel Privacy-Preserving Authentication for Tree-Structured Data with Designated Verification in Outsourced Environments

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\(\mathbb {SIG}\) is a signature space for the watermarkable signature scheme.

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Titel: Watermarkable Signature with Computational Function Preserving
verfasst von: Kyohei Sudo
Masayuki Tezuka
Keisuke Hara
Yusuke Yoshida
Keisuke Tanaka
Verlag: Springer International Publishing
Buch: Provable and Practical Security
Print ISBN: 978-3-030-62575-7

Electronic ISBN: 978-3-030-62576-4

Copyright-Jahr: 2020
DOI: https://doi.org/10.1007/978-3-030-62576-4_7

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