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• W3100144370 abstract "Relativistic protocols have been proposed to overcome some impossibility results in classical and quantum cryptography. In such a setting, one takes the location of honest players into account, and uses the fact that information cannot travel faster than the speed of light to limit the abilities of dishonest agents. For example, various relativistic bit commitment protocols have been proposed. Although it has been shown that bit commitment is sufficient to construct oblivious transfer and thus multiparty computation, composing specific relativistic protocols in this way is known to be insecure. A composable framework is required to perform such a modular security analysis of construction schemes, but no known frameworks can handle models of computation in Minkowski space. By instantiating the systems model from the Abstract Cryptography framework with Causal Boxes, we obtain such a composable framework, in which messages are assigned a location in Minkowski space (or superpositions thereof). This allows us to analyse relativistic protocols and to derive novel possibility and impossibility results. We show that (1) coin flipping can be constructed from the primitive channel with delay, (2) biased coin flipping, bit commitment and channel with delay are all impossible without further assumptions, and (3) it is impossible to improve a channel with delay. Note that the impossibility results also hold in the computational and bounded storage settings. This implies in particular non-composability of all proposed relativistic bit commitment protocols, of bit commitment in the bounded storage model, and of biased coin flipping." @default.
• W3100144370 created "2020-11-23" @default.
• W3100144370 creator A5022087647 @default.
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• W3100144370 date "2019-04-01" @default.
• W3100144370 modified "2023-10-18" @default.
• W3100144370 title "Composable security in relativistic quantum cryptography" @default.
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• W3100144370 doi "https://doi.org/10.1088/1367-2630/ab0e3b" @default.
• W3100144370 hasPublicationYear "2019" @default.
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