Welcome to the resource topic for 2009/196
Title:
Analysis of one quantum bit string commitment
Authors: Zhengjun Cao
Abstract:A. Kent proposed a quantum bit string commitment protocol in 2003. Not using the standard two conjugate states |0\rangle, |1\rangle , |+\rangle and |-\rangle , the protocol uses \psi_0=|0\rangle and \psi_1=\sin \theta|0\rangle+\cos \theta |1\rangle , where \theta\neq 0. In this paper, we show that the protocol can not guarantee security to the receiver. (1-\frac{\sin^2 \theta}{2})n bits are definitely exposed to the receiver, where n is the length of the committed string.
ePrint: https://eprint.iacr.org/2009/196
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