Open AccessUnambiguous state discrimination and joint measurement attacks on passive side channel of the light source in BB84 decoy-state protocol
Author(s) -
D. V. Babukhin,
Denis Sych
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2086/1/012130
Subject(s) - bb84 , quantum key distribution , side channel attack , channel (broadcasting) , computer science , adversary , protocol (science) , joint (building) , computer security , key (lock) , computer network , engineering , cryptography , quantum cryptography , quantum , physics , alternative medicine , pathology , quantum mechanics , quantum information , medicine , architectural engineering
Quantum key distribution (QKD) has a promise of unconditionally secure communication between the remote sides. The real-world QKD implementations, however, have numerous loopholes, both of engeneering and physical origin, and compromise the security promise. In this work, we investigate two attack strategies on the passive side channel of the light source along with the optimal cloning attack on the BB84 protocol with decoy-states. We calculate an upper bound of a secret key rate for these situations and show that the joint measurement attack on the signal and side channel degree of freedom is more effective to the adversary.