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- W4313347218 abstract "AbstractSince its introduction in 1984, identity-based signature (IBS) schemes have been studied in different settings. But, there are very few constructions available in the multivariate quadratic polynomials (MQ) setting. The existing IBS schemes in the MQ-setting are either less efficient or do not have any formal security reduction. In this paper, we investigate the problem of constructing an efficient and provably secure IBS scheme in the MQ-setting. Our starting point is the recent IBS scheme of Chen et al. which is very efficient but has some issues related to correctness and lacks a formal justification of security. We propose a modified construction that addresses the limitations of the Chen et al. proposal while retaining its efficiency. For the security reduction, we introduce a new cryptographic parameterized assumption in the MQ-setting. Our modified proposal allows any arbitrary bit string to be an identity and the size of the public parameters does not depend on the size of the universe of identities in contrast to the original proposal. Therefore, our modified scheme works as an unbounded IBS. Finally, we provide some justification towards the intractability of the newly introduced assumption.KeywordsIdentity-based signatureMultivariate cryptographyPost-quantum securityProvable security" @default.
- W4313347218 created "2023-01-06" @default.
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- W4313347218 date "2022-01-01" @default.
- W4313347218 modified "2023-10-10" @default.
- W4313347218 title "Efficient IBS from a New Assumption in the Multivariate-Quadratic Setting" @default.
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- W4313347218 doi "https://doi.org/10.1007/978-3-031-22912-1_30" @default.
- W4313347218 hasPublicationYear "2022" @default.
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