2 research outputs found
A QKD Protocol Extendable to Support Entanglement and Reduce Unauthorized Information Gain by Randomizing the Bases Lists with Key Values and Invalidate Explicit Privacy Amplification
This paper suggests an improvement to the BB84 scheme in Quantum key
distribution. The original scheme has its weakness in letting quantifiably more
information gain to an eavesdropper during public announcement of unencrypted
bases lists. The security of the secret key comes at the expense of the final
key length. We aim at exploiting the randomness of preparation (measurement)
basis and the bit values encoded (observed), so as to randomize the bases lists
before they are communicated over the public channel. A proof of security is
given for our scheme and proven that our protocol results in lesser information
gain by Eve in comparison with BB84 and its other extensions. Moreover, an
analysis is made on the feasibility of our proposal as such and to support
entanglement based QKD. The performance of our protocol is compared in terms of
the upper and lower bounds on the tolerable bit error rate. We also quantify
the information gain (by Eve) mathematically using the familiar approach of the
concept of Shannon entropy. The paper models the attack by Eve in terms of
interference in a multi-access quantum channel. Besides, this paper also hints
at the invalidation of a separate privacy amplification step in the
"prepare-and-measure" protocols in general.Comment: 13 pages, 1 figure, submitted for review to the USENIX 200