Cryptology ePrint Archive: Report 2021/988

Concurrent Signatures from a Variety of Keys

George Teseleanu

Abstract: Concurrent signatures allow two entities to produce two ambiguous signatures that become binding once an extra piece of information (called the keystone) is released. Such a signature is developed by Chen \emph{et al.}, but it restricts signers to using the same public parameters. We describe and analyse a new concurrent signature that allows users to sign documents even if they use different underlying hard problems when generating their public parameters.

Category / Keywords: public-key cryptography / concurent signature, contract signing, digital signature

Original Publication (in the same form): INSCRYPT 2021

Date: received 23 Jul 2021

Contact author: george teseleanu at yahoo com

Available format(s): PDF | BibTeX Citation

Version: 20210728:062838 (All versions of this report)

Short URL: ia.cr/2021/988


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