Comparison of Post-Quantum Cryptography Algorithms for Authentication in Quantum Key Distribution Classical Channel

Post-quantum cryptography is becoming more popular due to the threat posed by quantum computers, which can defeat the majority of the public key cryptography primitives currently in use, such as discrete logarithmic problems, and digital signatures. Driven by the need to protect the digital infrastructure from the possible threat of quantum computers. Continuous research, collaboration, and evaluation are required to assure the development of robust and practical post-quantum cryptography systems capable of protecting sensitive data in the post-quantum era. Quantum Key Distribution classical channel currently uses classical cryptography algorithms that are not quantum-safe. To protect the classical channel from quantum computers. Current QKD schemes do not provide authentication and data confidentiality to overcome these insecurities Post-quantum cryptography algorithms can be used. Post-quantum cryptography algorithms like Falcon (digital signature) for authentication and Crystal-Kyber (key encapsulation mechanism) for encryption in the quantum key distribution in classical channels were used.