Unconditionally secure quantum bit commitment is impossible

Details Unconditionally secure quantum bit commitment is impossible Unconditionally secure quantum bit commitment is impossible

1996-05-30

arxiv.org/abs/quant-ph/9605044v2

Physics

Quantum Physics

4 pages, revtex. Journal version replacing the version published in the proceedings of PhysComp96. This is a significantly imp

Scientific paper

10.1103/PhysRevLett.78.3414

The claim of quantum cryptography has always been that it can provide protocols that are unconditionally secure, that is, for which the security does not depend on any restriction on the time, space or technology available to the cheaters. We show that this claim does not hold for any quantum bit commitment protocol. Since many cryptographic tasks use bit commitment as a basic primitive, this result implies a severe setback for quantum cryptography. The model used encompasses all reasonable implementations of quantum bit commitment protocols in which the participants have not met before, including those that make use of the theory of special relativity.

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