Quantum random number generator smaller than a fingernail and quantum cryptographic communication system
Lowering prices and reducing size makes it possible to introduce all communication devices

There have been growing concerns that existing encryption systems will collapse once quantum computers capable of prime factorization are commercialized. On the 23rd, SK Telecom announced that it has developed a Quantum Random Number Generator (QRNG) and a quantum cryptographic communication security system as security solutions for quantum computers.

Conventional optical communication contains countless photons, making it impossible to detect even if some keys are intercepted or duplicated, thus posing a high threat of hacking. This is also why existing encryption systems are expected to collapse once quantum computers are developed. However, a quantum encryption key is a single photon.

When A transmits information to B, the information becomes meaningless except during transmission via the 'normal course.' If a hacker intervenes midway to measure the information and retransmit it to B, the hacker cannot obtain the information due to the uncertainty and non-replicability principles, and B detects the fact of eavesdropping as the error is amplified.
Despite these advantages, quantum random number generators could not be commercialized because they are at least the size of a palm and cost tens of millions of won. The quantum random number generator developed by SK Telecom is in the form of a 5x5mm chip, smaller than a fingernail, and costs tens of thousands of won. An SKT engineer introducing the chip said, “Once we reach the mass production stage, we plan to distribute not only the chip but also the aftermarket via USB, and if that happens, the price could drop below tens of thousands of won.”

"It is a security chip that can be introduced into all fields where communication is involved, such as digital certificates, Hardware Security Modules (HSMs) for connected cars, corporate servers, home IoT, and smart factories," said Kwak Seung-hwan, Head of SKT's Quantum Tech Lab. "We expect it to provide a high level of security for end-to-end communication."

SKT conducted technology tests at central stations in Seongnam, Suwon, Yongin, and Yangpyeong, and has been operating a security network utilizing quantum information and communication technology on the LTE network throughout Sejong City from June of last year until now. Lab Director Kwak Seung-hwan stated, "We plan to implement quantum technology by the third quarter of this year with the goal of applying it to all networks," and added, "We are also researching how to apply encryption to Li-Fi, a wireless communication technology that utilizes light."