Kyber is one of post quantum cryptography techniques that has been formally standardized by NIST. In fact, Kyber-512 exhibits the lowest security but achieves the fastest speed relative to other algorithms within the same family. Hence, this algorithm is appropriate to be implemented on resource-constrained devices regularly seen in IoT applications. The design of this research is divided into two main sections. The first part is a comparison about the process to exchange the secret key across Kyber-512, RSA (2048 bits), and ECC over a prime field (224 bits), using a 256-bit secret key as the secret message. Experimental results indicate that although Kyber-512 requires more processing time than RSA and ECC, it achieves average encryption and decryption periods only 8.3 milliseconds and 2.5 milliseconds, respectively, simulated on a general-purpose computer. However, the primary benefit of Kyber-512 is the resilience against quantum computer attacks. The second part evaluates the performance of Kyber-512 and AES-128, both of which provide analogous security levels. This study exploits two forms of data: a structured dataset and grayscale digital images. The results demonstrate that Kyber-512 requires a significantly greater processing time than AES-128 in both contexts. Therefore, the recommendation is that Kyber-512 should only be used for exchanging the secret key, whereas AES-128 should be employed for encryption and decryption processes.