You hear about encryption every day, but it seems that no one really does it. I have asked all my friends about encryption and not a single one has actually encrypted the data on their computers or external hard drives. And these are people who do practically everything online from paying taxes to ordering food to reading the newspaper. The single most important thing you can do is encrypt your data. It’s not a very hard process on Windows or Mac and once you do it the first time, you really don’t have to do anything again.
Here’s an article I wrote back in 2007 that still applies today. It’s about how to encrypt your hard drive using a program called True Crypt, which is free and still one of the most popular programs for encrypting data. What about encrypting a flash drive? I’ve written about that too, 3 years ago! You can also use True Crypt to encrypt a flash drive or external storage device.
Encrypting your data ensures that if someone were to get a hold of your computer or external drive, they would not be able to simply plug it in and view all your files. Without knowing your password to log into the system, they could not access any of the data stored on the drive. Which brings me to the second point.
" Computer Tips Step 1- Encrypt Your Data "
Reference : online-tech-tips.com