Computer Science – Cryptography and Security
Scientific paper
2001-07-20
IEEE Trans. Inform. Theory, vol. 50, p. 394, Feb. 2004
Computer Science
Cryptography and Security
8 pages, 4 figures. Submitted to the IEEE for possible publication. Revised version to improve its clarity
Scientific paper
10.1109/TIT.2003.822618
Two parties, Alice and Bob, wish to distill a binary secret key out of a list of correlated variables that they share after running a quantum key distribution protocol based on continuous-spectrum quantum carriers. We present a novel construction that allows the legitimate parties to get equal bit strings out of correlated variables by using a classical channel, with as few leaked information as possible. This opens the way to securely correcting non-binary key elements. In particular, the construction is refined to the case of Gaussian variables as it applies directly to recent continuous-variable protocols for quantum key distribution.
Assche Van G.
Cardinal Jean
Cerf Nicolas J.
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