Shin Jeong-hwan, head of KT’s Quantum Tech Research Team, made this remark at the “KT Quantum Cryptography Technology Study” recently held in Gwanghwamun, Seoul, where he introduced a “hybrid quantum security” strategy that combines quantum key distribution (QKD) and post-quantum cryptography (PQC).
KTCorporation(030200)KT is accelerating its push into the next-generation security market by promoting the “Quantum Safe Network,” which combines QKD and PQC. The strategy aims to ensure both security and cost-effectiveness by applying QKD to transmission segments—where security is paramount—and PQC to access and service segments.
“QKD Alone Is Cost-Prohibitive”… Adopting a Hybrid Strategy
QKD is a technology that utilizes the properties of quantum mechanics to instantly detect eavesdropping during the encryption key distribution process. PQC is a technology that applies cryptographic algorithms—which are difficult to decrypt even with quantum computers—to existing networks.
Instead of applying QKD to all segments, KTCorporation has adopted a hybrid structure that uses QKD for core segments and PQC for general segments.
A KTCorporation official explained, “Deploying QKD still involves significant costs,” adding, “Applying both QKD and PQC is a realistic strategy that takes cost and scalability into account.”
Development of Standalone Equipment… “Utilizing Existing Communication Networks as-Is”
KTCorporation also highlighted compatibility with existing communication networks as a key strength.
A KTCorporation official explained, “Without standalone equipment, existing equipment would need to be modified, which limits compatibility,” adding, “KTCorporation has secured equipment that operates independently, enabling the implementation of quantum security simply by connecting it to existing telecommunications equipment.”
The official added, “Another differentiating factor is that we are not only developing our own technology but also building an equipment ecosystem in collaboration with partner companies.”
Secured National Intelligence Service Certification… Expanding into Finance and Defense
KTCorporation has also laid the groundwork for entering the public sector market by obtaining the National Security Function Confirmation Certificate from the National Intelligence Service for its QKD equipment.
Having secured the National Security Function Certification from the National Intelligence Service, KT plans to expand its application primarily in sectors with high security requirements, such as defense and finance.
KTCorporation is currently working with the Ministry of National Defense on a project to apply PQC to drones, CCTV, and integrated control systems, and is also in discussions with the financial sector regarding the implementation of quantum security.
Cho Min-kyun, Team Leader of KTCorporation’s Dedicated Line Service Team, stated, “Our ultimate goal is to secure the capability to transition the entire existing IT environment used by our customers to a PQC-based system.”
KTCorporation holds 28 core patents related to quantum security and has completed the transfer of 12 technologies to eight companies based on its proprietary technology.
Team Leader Cho Min-kyun said, “Although the quantum market is still in its early stages, we are proactively building an industrial ecosystem in line with the government’s roadmap for fostering quantum technology,” adding, “We will steadily lay the groundwork to prepare for the quantum era.”
