Information hiding is any attempt to prevent people from being able to see information. It can be hiding the content of a letter, or it can be applied to hiding how the letter is delivered. Both ways can prevent people from being able to see the information.
Newbie: Information hiding is a very effective way to protect your data. If a hacker cannot see what it is he is trying to hack, they may have no idea if it is worth the trouble. The phrase “out of sight, out of mind” is directly applicable here. Hide the information in storage, transit, and use so it can’t be seen but also so hackers won’t know if it’s worth anything.