QUANTUM KEY DISTRIBUTION DEVICE, QUANTUM KEY DISTRIBUTION SYSTEM, AND QUANTUM KEY DISTRIBUTION METHOD

摘要

According to an embodiment, a quantum key distribution device includes a sharer, a key distillation processor, a first manager, and a second manager. The sharer is configured to share a photon string with the another quantum key distribution device using quantum key distribution via a quantum distribution channel, and obtain a photon bit string corresponding to the photon string. The key distillation processor is configured to generate a link key from the photon bit string. The first manager is configured to store the link key as a link transmission key. The second manager is configured to store, in a storage, a first application key from an application key to be used in cryptographic data communication, encrypt a second application key from the application key, using the link transmission key, and send the encrypted second application key to another quantum key distribution device via a classical communication channel.

主权项

1. A quantum key distribution device that is connected to another quantum key distribution device by a quantum communication channel and a classical communication channel and that shares a cryptographic key with the another quantum key distribution device, the quantum key distribution device comprising:
a quantum key sharer configured to share a photon string with the another quantum key distribution device using quantum key distribution via the quantum distribution channel, and obtain a photon bit string corresponding to the photon string; a key distillation processor configured to generate a link key as the cryptographic key from the photon bit string by a key distillation process; a first manager configured to store the link key as a link transmission key to be used in data encryption in an internal or external storage; a second manager configured to
store, in the storage, a first application key that has a predetermined role decided therefor from an application key that is the cryptographic key to be used in cryptographic data communication,encrypt a second application key that has a role corresponding to the first application key decided therefor from the application key, using the link transmission key, andsend the encrypted second application key to the another quantum key distribution device via the classical communication channel; and a key manager configured to manage the first application key that is stored in the storage for use in encryption or decryption when an application performs data communication.