Paper 2022/1127
GUC-Secure Commitments via Random Oracles: New Impossibility and Feasibility
, Zhejiang University, Zhejiang University, Virginia Commonwealth University, Zhejiang UniversityAbstract
In the UC framework, protocols must be subroutine respecting; therefore, shared trusted setup might cause security issues. To address this drawback, Generalized UC (GUC) framework is introduced by Canetti \emph{et al.} (TCC 2007). In this work, we investigate the impossibility and feasibility of GUC-secure commitments using global random oracles (GRO) as the trusted setup. In particular, we show that it is impossible to have a 2-round (1-round committing and 1-round opening) GUC-secure commitment in the global observable RO model by Canetti \emph{et al.} (CCS 2014). We then give a new round-optimal GUC-secure commitment that uses only Minicrypt assumptions (i.e. the existence of one-way functions) in the global observable RO model. Furthermore, we also examine the complete picture on round complexity of the GUC-secure commitments in various global RO models.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- A minor revision of an IACR publication in ASIACRYPT 2022
- Keywords
- GUC Global random oralces Commitment
- Contact author(s)
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zl_zhou @ zju edu cn
bingsheng @ zju edu cn
hszhou @ vcu edu
kuiren @ zju edu cn - History
- 2022-09-30: last of 2 revisions
- 2022-08-30: received
- See all versions
- Short URL
- https://ia.cr/2022/1127
- License
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CC BY-NC
BibTeX
@misc{cryptoeprint:2022/1127,
author = {Zhelei Zhou and Bingsheng Zhang and Hong-Sheng Zhou and Kui Ren},
title = {{GUC}-Secure Commitments via Random Oracles: New Impossibility and Feasibility},
howpublished = {Cryptology {ePrint} Archive, Paper 2022/1127},
year = {2022},
url = {https://eprint.iacr.org/2022/1127}
}
