Kt Corporation

Choon-gul Park

Ji-Eun Lee

Chan-kyou Hwang

Bom-Soo Kim

Ki-Tae Jeong

Hyong-Muk Lim

Provided are a quantum key distribution method, device, and system. The quantum key distribution system may include: a (1-1)th quantum key distribution device (QKD-); a (2-1)th quantum key distribution device (QKD-) connected to the QKD-by a first quantum channel (CH); a (3-1)th quantum key distribution device (QKD-) connected to a (1-2)th quantum key distribution device (QKD-) by a second quantum channel (CH); a first quantum node control device (QNC) for controlling the operation of the QKD-and the QKD-; a second quantum node control device (QNC) for controlling the operation of the QKD-; and a third quantum node control device (QNC) for controlling the operation of the QKD-, wherein: in the QNC, the first quantum key passes through a plurality of paths including a first path (P) for connecting the QNCand the QNC, so as to bypass the CH, thereby being transmitted to the QNC; and in the P, the key is encoded with a third quantum key shared between the QKD-and the QKD-, and is transmitted.

Quantum key distribution method, device, and system

A method performed under a transport SDN (Software Defined Network) controller may include classifying respective ones of a plurality of target nodes as either first target nodes that belong to a first domain or second target nodes that belong to a second domain, selecting a first core node in the first domain and a second core node in the second domain, calculating a first pseudo-wire (PW) between the selected first core node and the classified first target nodes, and calculating a second pseudo-wire (PW) between the selected second core node and the classified second target nodes.

Implementing an E-LAN between multi-nodes utilizing a transport network controller

Provided is a method of distributedly storing an individual content in a hierarchical storage system including a solid state storage having a plurality of solid state disks, a hard disk storage having a plurality of hard disks, and a tape storage. The method may include determining a target content to store and an inquiry frequency and a required minimum transmission rate of the target content upon receipt of a request message from a client device, classifying the target content as at least one of a low demanded content, a normal demanded content, a high demanded content, a low transmission rate content, a normal transmission rate content, and a high transmission rate content based on the inquiry frequency and the required minimum transmission rate of the target content, and distributedly storing the target content through at least one of the solid state storage, the hard disk storage, and the tape storage based on the classification result and a distribution and buffering policy.

Growing community of inventors

Daejeon, South Korea

Choon-gul Park