Unconditionally Secure Quantum Bit Commitment is Impossible
نویسندگان
چکیده
منابع مشابه
Unconditionally secure quantum bit commitment is impossible
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 r...
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Unconditionally secure quantum bit commitment has been shown to be impossible by Mayers [22] and Lo and Chau [18, 19], but the claim is repeatedly challenged. The bit commitment theorem is reviewed here and the central conceptual point, that an ”Einstein-PodolskyRosen’ attack or cheating strategy can always be applied, is clarified. The question of whether following such a cheating strategy can...
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Bit commitment involves the submission of evidence from one party to another so that the evidence can be used to confirm a later revealed bit value by the first party, while the second party cannot determine the bit value from the evidence alone. An unconditionally secure bit commitment protocol utilizing quantum states is presented. The generality of previous proofs on the impossibility of qua...
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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 α|0〉 + β|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, bit commit...
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Lo and Chau, and independently Mayers, have shown that all quantum bit commitment schemes proposed to date are insecure: one or both participants can cheat if they have a quantum computer. They claim also to have demonstrated that unconditionally secure quantum bit commitment is impossible. However, their no-go arguments rely on models of quantum cryptographic protocols which are insufficiently...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1997
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.78.3414