Randomness in Distribution Protocols

Carlo Blundo, Alfredo De Santis, Ugo Vaccaro

Yuefei Zhu

This paper first gives the notion about distributed cryptographic protocol with distributed characteristics of space and time.Then research distributed cryptographic protocol based on the notion.For an instance,we use proactive security in an distributed key distribution system only with distributed characteristic of space and give a distributed protocol against mobile adversary.This paper enlarges research field of distributed cryptographic protocol.At last,this paper proves the security of distributed random key distribution protocol based on the probability space.

Huaicong Li, Chun-Mei Zhang

The twin-field quantum key distribution (TF-QKD) protocol and its variants can overcome the well-known rate-loss bound without quantum repeaters, which have attracted significant attention. Generally, to ensure the security of these protocols, weak coherent states with continuous randomized phases are always assumed in the test mode. However, this assumption is difficult to meet in practice. To bridge the gap between theory and practice, we propose two alternative discrete-phase-randomized (DPR)-twin-field quantum key distribution protocols, which remove the phase sifting procedure in the code mode. Simulation results show that when compared with previous discrete-phase-randomized-twin-field quantum key distribution protocols, our modified protocols can significantly improve the secret key rate in the low channel loss range, which is very promising for practical twin-field quantum key distribution systems.

Hari Krishnan P. Anilkumar, Varun Narayanan, Manoj Prabhakaran +1 more

Omar Amer, Shouvanik Chakrabarti, Kaushik Chakraborty +8 more

Christian Weedbrook, Andrew M. Lance, Warwick P. Bowen +3 more

The random switching of measurement bases is commonly assumed to be a necessary step of quantum key distribution protocols. In this paper we present a no-switching protocol and show that switching is not required for coherent-state continuous-variable quantum key distribution. Further, this protocol achieves higher information rates and a simpler experimental setup compared to previous protocols that rely on switching. We propose an optimal eavesdropping attack against this protocol, assuming individual Gaussian attacks. Finally, we investigate and compare the no-switching protocol applied to the original Bennett-Brassard 1984 scheme.