|
| related topics |
| {key, protocol, security} |
| {particle, mechanics, theory} |
| {field, particle, equation} |
| {state, phys, rev} |
| {time, systems, information} |
|
Unconditionally Secure Commitment of a Certified Classical Bit is
Impossible
Adrian Kent
abstract: In a secure bit commitment protocol involving only classical physics, A
commits either a 0 or a 1 to B. If quantum information is used in the protocol,
A may be able to commit a state of the form $\alpha \ket{0} + \beta \ket{1}$.
If so, she can also commit mixed states in which the committed bit is entangled
with other quantum states under her control. We introduce here a quantum
cryptographic primitive, {\it bit commitment with a certificate of
classicality} (BCCC), which differs from standard bit commitment in that it
guarantees that the committed state has a fixed classical value. We show that
no unconditionally secure BCCC protocol based on special relativity and quantum
theory exists. We also propose complete definitions of security for quantum and
relativistic bit commitment.
- oai_identifier:
- oai:arXiv.org:quant-ph/9910087
- categories:
- quant-ph cs.CR
- comments:
- 5 pages, RevTeX. Minor clarification made distinguishing proper and
improper mixed state commitments
- doi:
- 10.1103/PhysRevA.61.042301
- arxiv_id:
- quant-ph/9910087
- journal_ref:
- Phys. Rev. A 61, 042301 (2000)
- report_no:
- DAMTP-1999-51
- created:
- 1999-10-20
- updated:
- 1999-11-03
Full article ▸
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