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