Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/8824
Title: Malleability and ownership of proxy signatures: Towards a stronger definiton and its limitations
Authors: Chatterjee, Sanjit
Ustaoğlu, Berkant
Keywords: Proxy signatures
Malleability
Owndership
Multi-user security
Provable security
Issue Date: 2020
Publisher: American Institute of Mathematical Sciences
Abstract: Proxy signature is a cryptographic primitive that allows an entity to delegate singing rights to another entity. Noticing the ad-hoc nature of security analysis prevalent in the existing literature, Boldyreva, Palacio and Warinschi proposed a formal security model for proxy signature. We revisit their proposed security definition in the context of the most natural construction of proxy signature - delegation-by-certificate. Our analysis indicates certain limitations of their definition that arise due to malleability of proxy signature as well as signature ownership in the context of standard signature. We propose a stronger definition of proxy signature to address these issues. However, we observe that the natural reductionist security argument of the delegation-by certificate proxy signature construction under this definition seems to require a rather unnatural security property for a standard signature.
URI: https://doi.org/10.3934/amc.2020015
https://hdl.handle.net/11147/8824
ISSN: 1930-5346
1930-5338
Appears in Collections:Mathematics / Matematik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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