Data security is still a major worry with the growth of cloud computing. To protect data while it is being sent and stored, hybrid encryption—which combines the advantages of symmetric and asymmetric algorithms—is being used more and more. Five sophisticated hybrid encryption techniques are compared in this study: PQXDH, PQ3, CECPQ2, Hybrid Cryptography Combination, and the Hybrid Encryption Model of IoT. This work seeks to identify the best reliable and scalable encryption technique appropriate for contemporary cloud infrastructures by analyzing their designs, post-quantum resilience, efficiency, and compatibility with cloud deployment.