Researchers are developing key technology for the commercialization of quantum cryptography

In modern cryptosystems, users generate public and private keys that guarantee security based on computational complexity and use them to encrypt and decrypt information. Recently, however, modern public-key cryptosystems have been exposed to potential security vulnerabilities compared to quantum computers with large computing power.

Quantum cryptosystems have received much attention as a solution. They use quantum keys that guarantee security based on quantum physics and not computational complexity, making them safe from quantum computers as well. Therefore, it is expected that quantum cryptosystems will replace modern cryptosystems.

Quantum key distribution (QKD) is the most important technology for realizing quantum cryptosystems. Two main technical issues should be addressed in order to commercialize QKD. One is communication distance and the other is extension from one-to-one (1:1) communication to one-to-many (1:N) or many-to-many (N:N) network communication.

Doubtful (TF) QKD,...

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