title: Insecurity of Detector-Device-Independent Quantum Key Distribution.
abstract: Detector-device-independent quantum key distribution (DDI-QKD) held the promise of being robust to detector side channels, a major security loophole in quantum key distribution (QKD) implementations. In contrast to what has been claimed, however, we demonstrate that the security of DDI-QKD is not based on postselected entanglement, and we introduce various eavesdropping strategies that show that DDI-QKD is in fact insecure against detector side-channel attacks as well as against other attacks that exploit devices' imperfections of the receiver. Our attacks are valid even when the QKD apparatuses are built by the legitimate users of the system themselves, and thus, free of malicious modifications, which is a key assumption in DDI-QKD.
authors.affiliation: Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada.|Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada.
authors.forename: Shihan
authors.initials: S
authors.lastname: Sajeed
authors.affiliation: Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada.|Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada.
authors.forename: Anqi
authors.initials: A
authors.lastname: Huang
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, China.
authors.forename: Shihai
authors.initials: S
authors.lastname: Sun
authors.affiliation: Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
authors.forename: Feihu
authors.initials: F
authors.lastname: Xu
authors.affiliation: Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada.|Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada.|Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada.
authors.forename: Vadim
authors.initials: V
authors.lastname: Makarov
authors.affiliation: Escuela de Ingeniería de Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vigo E-36310, Spain.
authors.forename: Marcos
authors.initials: M
authors.lastname: Curty