We study the entanglement-based attack on a recently proposed quantum oblivious transfer (OT) protocol (Nagy and Nagy in Quantum Inf Process 15:5037, 2016). While in secure OT, Bob’s probability of obtaining Alice’s secret bit unambiguously should be limited to $$50\%$$ 50 % , we show that if Bob has the technology to handle 5-body entangled states in the current protocol, then he can increase this probability to $$64.6\%$$ 64.6 % . More importantly, in contrast to what the authors claimed, increasing the number of qubits used in the protocol cannot increase the hardness of Bob’s attack.
Quantum Information Processing – Springer Journals
Published: Feb 24, 2017
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