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• W2949304148 abstract "Universal composability and concurrent general composition consider a setting where secure protocols are run concurrently with each other and with arbitrary other possibly insecure protocols. Protocols that meet the definition of universal composability are guaranteed to remain secure even when run in this strongly adversarial setting. In the case of an honest majority, or where there is a trusted setup phase of some kind (like a common reference string or the keyregistration public-key infrastructure of Barak et al. in FOCS 2004), it has been shown that any functionality can be securely computed in a universally composable way. On the negative side, it has also been shown that in the plain model where there is no trusted setup at all, there are large classes of functionalities which cannot be securely computed in a universally composable way without an honest majority. In this paper we extend these impossibility results for universal composability. We study a number of public-key models and show for which models the impossibility results of universal composability hold and for which they do not. We also consider a setting where the inputs to the protocols running in the network are fixed before any execution begins. The majority of our results are negative and we show that the known impossibility results for universal composability in the case of no honest majority extend to many other settings." @default.
• W2949304148 created "2019-06-27" @default.
• W2949304148 creator A5033036383 @default.
• W2949304148 creator A5087379069 @default.
• W2949304148 date "2007-01-01" @default.
• W2949304148 modified "2023-09-26" @default.
• W2949304148 title "Impossibility Results for Universal Composability in Public-Key Models and with Fixed Inputs." @default.
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