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RSS FeedsEntropy, Vol. 21, Pages 821: Quantum Contract Signing with Entangled Pairs (Entropy)


22 august 2019 23:01:01

Entropy, Vol. 21, Pages 821: Quantum Contract Signing with Entangled Pairs (Entropy)

We present a quantum scheme for signing contracts between two clients (Alice and Bob) using entangled states and the services of a third trusted party (Trent). The trusted party is only contacted for the initialization of the protocol, and possibly at the end, to verify clients’ honesty and deliver signed certificates. The protocol is fair, i.e., the probability that a client, say Bob, can obtain a signed copy of the contract, while Alice cannot, can be made arbitrarily small, and scales as N − 1 / 2 , where 4 N is the total number of rounds (communications between the two clients) of the protocol. Thus, the protocol is optimistic, as cheating is not successful, and the clients rarely have to contact Trent to confirm their honesty by delivering the actual signed certificates of the contract. Unlike the previous protocol (Paunkovic et al., Phys. Rev. A 84, 062331 (2011)), in the present proposal, a single client can obtain the signed contract alone, without the need for the other client’s presence. When first contacting Trent, the clients do not have to agree upon a definitive contract. Moreover, even upon terminating the protocol, the clients do not reveal the actual contract to Trent. Finally, the protocol is based on the laws of physics, rather than on mathematical conjectures and the exchange of a large number of signed authenticated messages during the actual contract signing process. Therefore, it is abuse-free, as Alice and Bob cannot prove they are involved in the contract signing process. Digg Facebook Google StumbleUpon Twitter
95 viewsCategory: Informatics, Physics
Entropy, Vol. 21, Pages 819: Image Encryption Scheme with Compressed Sensing Based on New Three-Dimensional Chaotic System (Entropy)
Entropy, Vol. 21, Pages 820: Thermodynamic, Non-Extensive, or Turbulent Quasi-Equilibrium for the Space Plasma Environment (Entropy)
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