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2018 | OriginalPaper | Buchkapitel

Invisible Sanitizable Signatures and Public-Key Encryption are Equivalent

verfasst von : Marc Fischlin, Patrick Harasser

Erschienen in: Applied Cryptography and Network Security

Verlag: Springer International Publishing

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Abstract

Sanitizable signature schemes are signature schemes which support the delegation of modification rights. The signer can allow a sanitizer to perform a set of admissible operations on the original message and then to update the signature, in such a way that basic security properties like unforgeability or accountability are preserved. Recently, Camenisch et al. (PKC 2017) devised new schemes with the previously unattained invisibility property. This property says that the set of admissible operations for the sanitizer remains hidden from outsiders. Subsequently, Beck et al. (ACISP 2017) gave an even stronger version of this notion and constructions achieving it. Here we characterize the invisibility property in both forms by showing that invisible sanitizable signatures are equivalent to \(\mathsf {IND{-}}\mathsf {CPA}\)-secure encryption schemes, and strongly invisible signatures are equivalent to \(\mathsf {IND{-}}\mathsf {CCA2}\)-secure encryption schemes. The equivalence is established by proving that invisible (resp. strongly invisible) sanitizable signature schemes yield \(\mathsf {IND{-}}\mathsf {CPA}\)-secure (resp. \(\mathsf {IND{-}}\mathsf {CCA2}\)-secure) public-key encryption schemes and that, vice versa, we can build (strongly) invisible sanitizable signatures given a corresponding public-key encryption scheme.

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Nächstes Kapitel Delegatable Attribute-Based Anonymous Credentials from Dynamically Malleable Signatures

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Titel: Invisible Sanitizable Signatures and Public-Key Encryption are Equivalent
verfasst von: Marc Fischlin
Patrick Harasser
Verlag: Springer International Publishing
Buch: Applied Cryptography and Network Security
Print ISBN: 978-3-319-93386-3

Electronic ISBN: 978-3-319-93387-0

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-319-93387-0_11

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