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Signing Perfect Currency Bonds

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arxiv 1505.05251 v2 pith:IM4EU23H submitted 2015-05-20 quant-ph cs.CR

classification quant-phcs.CR
keywords chequequantumschemebanksecureadversaryalteredalternate
verification ladder T0 review T1 audit T2 compute T3 formal
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We propose the idea of a Quantum Cheque Scheme, a cryptographic protocol in which any legitimate client of a trusted bank can issue a cheque, that cannot be counterfeited or altered in anyway, and can be verified by a bank or any of its branches. We formally define a Quantum Cheque and present the first Unconditionally Secure Quantum Cheque Scheme and show it to be secure against any no-signaling adversary. The proposed Quantum Cheque Scheme can been perceived as the quantum analog of Electronic Data Interchange, as an alternate for current e-Payment Gateways.

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