Cryptography is the art of keeping information secret and safe by transforming it into form that unintended recipients cannot understand. It makes secure data transmission over the internet possible.

When this era of quantum computing arrives, we will reach the point where post-quantum cryptography (PCQ) becomes essential.

This paper presents a design of data encryption and decryption in a network environment using RSA algorithm with a specific message block size.

Behind the hype lies a grounded, strategic reality: transitioning to post-quantum cryptography is about preparation, not panic.

Encryption algorithms are designed so that performing the decryption process is unfeasibly hard without knowing the key.

A new system uses JavaScript decryption algorithms embedded in web pages and code obfuscation to patch security holes left open by web browsers' private-browsing functions.

In this paper, a hardware implementation of the AES128 encryption and decryption algorithm is proposed.