KT announced on the 26th that it has applied a hybrid quantum encryption communication network integrating quantum key distribution (QKD) and post-quantum cryptography (PQC)-VPN to its 5G USIM network, the first in the country.
The 5G USIM network refers to the network that transmits USIM information registered with KT by the USIM manufacturer or provides USIM information for user authentication during mobile phone subscription procedures. With the advancement of technologies such as quantum computers, this network may be exposed to hacking threats. In such cases, key data, such as user authentication information, could be replicated, leading to significant damage.
The network structure applied to the 5G USIM network this time is a new hybrid configuration that combines QKD and PQC-VPN, connecting both external (internet) and internal (dedicated line) networks within KT. This network spans a total transmission distance of 580 km with 15 nodes connecting the internal KT network and USIM manufacturers.
The hybrid quantum encryption communication network has the advantage of being able to fundamentally block hacking by quantum computers using mathematical algorithms and the principles of quantum mechanics, even in diverse environments consisting of wired and wireless connections.
Lee Jong-sik, head of KT's future network research institute in the network division, noted, “KT will continue to make efforts for the activation of the domestic quantum industry market and the stability of future networks based on its own quantum security technology development, service discovery, and technology transfer.”