고행석, 지세완, 장진각,

Vol. 30, No. 5, pp. 771-780, Oct. 2020
10.13089/JKIISC.2020.30.5.771, Full Text:
Keywords: QKD, Role of Cryptographic Application, Quantum Key, key sharing, Key Management
Abstract

QKD(Quantum Key Distribution) is one of the protocols that can make two distant parties safely share secure keysagainst the threat of quantum computer. Generally, cryptographic applications which are connected to the QKD device havefixed roles as a transmitter and a receiver due to the race condition and complexity of implementation. Because theconventional QKD system is mainly applied to the link encryptor, there are no problems even if the roles of thecryptographic devices are fixed. We propose a new scheme of QKD system and protocol that is easy to extend to the QKDnetwork by eliminating quantum key dependency between cryptographic device and QKD node. The secure keys which aregenerated by the TRNG(True Random Number Generator) are provided to the cryptographic applications instead of quantumkeys. We design an architecture to transmit safely the secure keys using the inbound and outbound quantum keys which areshared between two nodes. In this scheme, since the dependency of shared quantum keys between two QKD nodes iseliminated, all cryptographic applicatons can be a master or a slave depending on who initiates the cryptographiccommunications.

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