Building and Developing a Data Protection Service System Based on Postquantum Cryptography Solutions

In the rapidly evolving field of quantum computing technology, postquantum cryptography (PQC) plays a pivotal role in developing secure cryptographic systems that are resistant to both quantum and classical computers. This paper focuses on the integration and implementation of PQC algorithms such as Falcon and Dilithium for digital signatures, as well as Crystal-Kyber for key encapsulation mechanisms. Through a server–client model, the study has deployed a postquantum secure communication service achieving encryption times of less than 2 ms, signing performance up to 50 ms for small files and 11 073 ms for large files, and key exchange times as low as 16 ms. These metrics provide deep insights into the resilience and security of the proposed cryptographic solutions in real-world environments.