I made this tutorial to teach friends and colleagues how to setup their Gmail for encryption.
Encryption is very important because e-mails are very unsecure. An e-mail is equivalent to a postcard, ANYBODY CAN READ IT.
So if you want to send personal and private information, you better encrypt.
By the way, you need windows in order to run the programs mentioned here, if you have a mac then go to this instructable.
Step 1: The Programs Needed
You will need windows, a Firefox browser and a Gmail account as well as GPG4Win and FireGPG.
GPG4Win does the encryption on a windows machine.
FireGPG adds encryption functionality in Gmail.
Step 2: How Encryption Works
Every person have a pair of keys.
Each key is a number that fits in an equation.
One key is shared with everyone, and is called the "public key".
One key is private and you hide it on your computer or on you flash disk and this is called a "private key".
The e-mail cannot be opened without using both keys.
The person sending you an encrypt e-mail must know your public key in order to encrypt it. The e-mail cannot be opened except with your private key which you only have.