IDEMIA Secure Transactions Collaborates With KT in Advancing Post-Quantum Security For South Korea’s Defense Communications

Quantum‑Resistant SIMs for Defense Communications

South Korea’s defense sector is preparing for the arrival of quantum computers by testing a new generation of secure‑element hardware. IDEMIA Secure Transactions (IST) has partnered with telecom operator KT to integrate post‑quantum cryptography (PQC) into SIM and eSIM cards that will serve as the hardware root of trust for a wide range of defense systems.

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A pilot that spans the whole defense stack

The project is part of the 2026 Post‑Quantum Cryptography Pilot Conversion Project, coordinated by the Ministry of Science and ICT (MSIT) and the Korea Internet & Security Agency (KISA). While KT leads the broader pilot, IST supplies the Quantum‑Resistant SIM platform, which embeds both NIST‑standardized and Korean‑specific (KpqC‑1) algorithms. The pilot will evaluate the SIM’s performance in:

• Smart‑unit platforms and user PCs used by the Ministry of National Defense
• CCTV and video‑storage systems
• Unmanned aerial vehicles and ground‑control stations
• 5G network infrastructure supporting battlefield communications

By placing cryptographic operations inside a tamper‑resistant secure element, the SIM can generate and protect credentials without exposing them to the host device’s software stack.

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Overcoming the challenges of PQC on a smart‑card

Post‑quantum algorithms typically demand more CPU cycles and memory than classic RSA or ECC schemes. IST addresses these constraints by designing a dedicated PQC SIM/eSIM that offloads the heavy computation to a hardened microcontroller. This approach keeps the device‑level changes minimal: existing phones, tablets, and embedded modules can continue to use their current form factor while gaining quantum‑safe key exchange and authentication.

The dual‑algorithm support also provides crypto‑agility—the ability to switch or update algorithms as standards evolve—without redesigning the entire hardware platform. This flexibility is crucial for a defense environment where regulatory and threat landscapes can shift rapidly.

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Implications for Korean and global security

If validated, the pilot will deliver the first implementation of KpqC‑1 algorithms on a Korean smart‑card, showcasing a practical path for national standards to coexist with international ones. Success could accelerate the rollout of quantum‑safe credentials across civilian telecom, IoT, and critical‑infrastructure sectors, leveraging the same SIM technology already deployed at massive scale.

Beyond the immediate defense use case, the project highlights a broader trend: SIM and eSIM technologies are evolving from subscriber authentication tools to universal cryptographic modules. Their widespread presence in mobile devices, connected vehicles, and industrial equipment makes them an attractive anchor for future quantum‑resilient security services.

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Looking ahead

South Korea’s aggressive timeline for PQC adoption reflects a national strategy to stay ahead of quantum threats. The IST‑KT collaboration demonstrates how industry partners can translate high‑level policy goals into concrete, testable hardware. As the pilot progresses, performance data from the field will inform standards bodies, guide further algorithm selection, and shape the next generation of secure‑element designs.

For organizations watching the quantum security landscape, the key takeaway is clear: building crypto‑agility at the hardware level now reduces the risk of costly redesigns later. Whether for defense, telecom, or enterprise IoT, quantum‑resistant SIMs offer a scalable, interoperable foundation for the quantum era.