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Conference on Lasers and Electro-Optics

Polarization independent DPS-QKD system using up-conversion detectors

Iwai, Honjo, Inoue, Kamada, Nishida, Tadanaga, Asobe

Published Jan 1, 2008• 0 citations
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Differential Phase Shift Quantum Key Distribution Using 1.3-µm Up-Conversion Detectors

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We report a differential phase shift quantum key distribution (DPS-QKD) experiment in the 1.3-µm band that uses single photon detectors based on a frequency up-conversion technique. By combining a fast-clock DPS-QKD and up-conversion detectors operated in a non-gated mode, we have achieved a sifted key rate of 180 kbit/s over 10 km of fiber, which is one order of magnitude larger than a previously reported 1.3-µm band result.

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Faked state attack on realistic round robin DPS quantum key distribution systems and countermeasure

Takehisa Iwakoshi

In May 2014, a new quantum key distribution protocol named “Round Robin Differential-Phase-Shift Quantum Key Distribution (RR DPS QKD)” was proposed. It has a special feature that the key consumption via privacy amplification is a small constant because RR DPS QKD guarantees its security by information causality, not by information-disturbance trade-off. Therefore, the authors claimed that RR DPS QKD systems does not need to monitor the disturbance by an attacker in the quantum channel. However, this study shows that a modified Faked-State Attack (or so-called bright illumination attack) can hack a RR DPS QKD system almost perfectly if it is implemented with realistic detectors even information-causality guarantees the security of RR DPS QKD protocol. Therefore, this study also proposes a possible Measurement-Device-Independent RR DPS QKD system to avoid the modified Faked-State Attack.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 7, 2015•2 citations
In May 2014, a new quantum key distribution protocol named “Round Robin Differential-Phase-Shift Quantum Key Distribution (RR DPS QKD)” was proposed. It has a special feature that the key consumption via privacy amplification is a small constant because RR DPS QKD guarantees its security by information causality, not by information-disturbance trade-off. Therefore, the authors claimed that RR DPS QKD systems does not need to monitor the disturbance by an attacker in the quantum channel. However, this study shows that a modified Faked-State Attack (or so-called bright illumination attack) can hack a RR DPS QKD system almost perfectly if it is implemented with realistic detectors even information-causality guarantees the security of RR DPS QKD protocol. Therefore, this study also proposes a possible Measurement-Device-Independent RR DPS QKD system to avoid the modified Faked-State Attack.