Data hiding conceals data within cover media, linking two datasets: embedded data and cover media data. In covert comms, hidden data is often irrelevant, while in authentication, it’s closely related. Invisibility is key. Sometimes, data hiding causes irreversible distortion in cover media. In remote sensing and high-energy particle experiments, reversible, lossless, and distortion-free techniques are vital. Reversible data hiding allows message embedding in distortion-free media, like military or medical images, ensuring perfect content restoration. Encryption transforms data into unintelligible content for privacy, typically applied before processing or after decryption.

• Data Encryption for Privacy
• Data Hiding Techniques
• Reversible Data Hiding