Author: Jan Havlín
Supervisor: Jan Hajný
Abstract: This bachelor thesis focuses on providing encrypted communication between two Linux operating system stations. It involves encryption using the AES-GCM-256 cipher, which uses a hybrid key derived from three separately generated keys. The methods for generating these keys are Quantum Key Distribution, CRYSTALS-Kyber and Elliptic Curve Diffie-Hellmann. Thus, we use functions of three types of cryptography – classical, quantum and post-quantum. The paper also deals with the extension of the functionality of the original cryptography to authenticate the communicating parties using certificates and deployment of the encryptor in practice.