Secure Classical Bit Commitment Using Fixed Capacity Communication Channels |
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Authors: | Adrian Kent |
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Institution: | (1) Centre for Quantum Computation, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, England |
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Abstract: | If mutually mistrustful parties A and B control two or more appropriately
located sites, special relativity can be used to guarantee that a pair
of messages exchanged by A and B are independent.
In earlier work we used this fact to define a
relativistic bit commitment protocol, RBC1, in which security
is maintained by exchanging a sequence of messages
whose transmission rate increases exponentially in time. We define
here a new relativistic protocol, RBC2, which requires only a constant
transmission rate and could be practically implemented. We prove that
RBC2 allows a bit commitment to be indefinitely maintained with
unconditional security against all classical attacks.
We examine its security against quantum attacks, and show that it is
immune from the class of attacks shown by Mayers and Lo-Chau to render
non-relativistic quantum bit commitment protocols insecure. |
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Keywords: | Bit commitment Relativistic cryptography Quantum cryptography |
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