[25p-D214-1~17] 3.10 Optical quantum physics and technologies

[25p-D214-2] Differential phase shift quantum digital signature

〇Kyo Inoue¹, Toshimori Honjo² (1.Osaka Univ., 2.NTT Basic Res. Labs.)

Keywords:quantum digital signature, quantum communication, differential phase shift

Digital signature is a system guaranteeing that message data are legitimate, wherein a sender distributes authentication keys in advance, and sends a message with a signature key. When the authentication and signature keys are matched, the message is acknowledged as legitimate. Quantum digital signature (QDS) is a technology that prevents a signature key is forged from a authentication key based on quantum mechanics. This presentation proposes a novel QDS protocol based on a differential phase shift scheme, which is simpler than conventional QDS in terms of the setup and key creation process.