Vol. 69, No. 1, pp. 65–74 (2017)

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Necessity of parameter randomization in quantum contract signing

Hana Almoner Louka

Faculty of Mathematics, University of Belgrade, Studentski trg 16, Beograd, Serbia E-mail: hanaalmoner@yahoo.com

Abstract: We present a proof that randomization is necessary in quantum contract signing protocol of Paunković, Bauda and Mateus. We prove that for any fixed value of the protocol parameter α, for large N the probability of cheating can be as high as 25%, where N is the number of messages exchanged between the parties, and thus without randomization the protocol is not fair.

Keywords: contract signing protocol; parameter randomization; qubit.

Classification (MSC2000): 81P94; 94A60

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Electronic fulltext finalized on: 29 Dec 2016. This page was last modified: 10 Jan 2017.

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