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Once you have
installed PGP and restarted your computer, you will notice a lock
icon in your system tray (bottom right corner of your screen). Click
on it and select Launch PGP keys from the menu that appears.
This will show a form which allows you create a key pair (used to
decrypt email received).
- After entering your name, email address and clicking on the Next button, set your key pair size to 1024 bits then press Next.
- Key pair never expires should be set, click Next.
- You have to enter a
passphrase (like a password except it can be a sentence) the
passphrase should include letters and numbers, e.g. i ate 123 large
apples in 1900 (make it a sentence you will remember easily and don't
just copy the example I gave). The quality of your passphrase (a
measure of how hard it is to guess) is shown by a blue bar that
increases with increasing quality. You may want to un-check the box
that says hide typing so that you can see what you are typing. You
have to type your passphrase out twice, once in the passphrase box
and once in the confirmation box.
Click Next and follow the procedure for creating the key pair:
- It is up to you if you send your key to the root server (for shopping carts - this may not apply to you).
- Keep clicking Next
until you reach the Finish button and click Finish.
Now you will need to email your Public Key:
- Select your name in the PGP keys window (e.g. mine is John Smith, etc...)
- Right click on your name and select Export... from the menu.
- Save the .asc somewhere where you can find it again later.
- email us the .asc
file as an attachment. In my case the .asc file is called "John
Smith.asc"
You can practice decrypting email messages by encrypting a message for yourself and then emailing it to your email address:
- Copy some text to the clipboard that you want to send to yourself as a test message.
- Click on the lock icon and select encrypt clipboard.
- Double click on your name in the list of keys in the key selection dialogue and click OK.
Now the text on the clipboard is an encrypted PGP message.
- Start a new email and paste the contents of the clip board into the body of the email. It will look something like this:
----- BEGIN PGP MESSAGE ----- Version: PGP freeware 6.0.2i qANQR1DBwE4D3dZVOUk5A2UQA/9MbFRUg7ibDF9KpfGtI8lPU5p6W7z1homDUw8V K1i16bDXwDoOl55DXaOcFhl8ZLYLG9YPKdc6eVeBzV6tNUlbk1Zq+gbAJh8rU1m7 vZD74sj5SCigvLy81Whxla1GvEL+h33B+AJSxnncgLNdzRFc2XHeqQIoBfU8lH4Y hEsZDAQAig/+Ij49tmZeTZu5rVYAqRRtkpag1VquILqzCpk024RQU+WPuGWSQh6A a1tPaEdQu1PMnFcSBA0KEQ1OoS3G8vcXA5DlWPz1KodnKHNyHYFY5GoshFz2wcN5 UiRAwyVACTa3sgh2HsukXMzjM7w3s3TumowlzWV/puV2BoK47CPJwraOg6tr+W8T KccxtLKupMYgeMtRbBZ4mg3gtY3BEMRB4WO/bqta6AHjwGCobYmA5Cj3yVGYqepw ----- END PGP MESSAGE -----
The message above is fake, you wont be able to decrypt it.
- Send the email
When you receive the email:
- Select the message body from
----- BEGIN PGP MESSAGE ----- to ----- END PGP MESSAGE ----- and copy it to the clipboard.
- Click on the lock icon again and select Decrypt & verify Clipboard.
- Enter your passphrase and click OK
You will now see the text you encrypted and sent to yourself. This is the process you will follow to decrypt email.
If you have forgotten your passphrase you will have to delete your old key pair and redo the key pair generation process.
To delete your key
pair, select your name from PGP keys and press delete on your
keyboard. Answer yes to both questions. Select Keys from the menu and
click on New.
Importing Public Key's:
- Receive a Public Key from someone.
- A Public Key looks like this:
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: PGP freeware 6.5.1 for noncommercial use <http://www.pgp.com> mQGiBDf12tcRBADIwqDLUp6UKT9U37nTQ4IJOH2nLNchI+xr4BNapO2cDkDwFFm7 WtO25nKMPzoqAkVI5O1goBZO0mmxURvKYRvTmShg3kdMTe+hZmRQ12YISg4HIn3Y r5RAsVnyuHgYSAxTdONZffO69lgwMbo8ouJjxgGNtZU4Ztk3vUjJpg/scwCg/zEZ 407p7nIo58MGCpMJcKxhV3/9zvTDsicW8ohqVgoixmGXe4XNY/Ec/SmSI0fF2X5/ ATZo0dFwxwtfONwt5M3M7UUo+FNDqiYO086UOdeHj12n62A/2tJUCXKJyq5REvud Cpe2GNMehsSMwThaTtXF7cAQB8Lc4l83vUwecyfzyKhQOW3qOXHt6lv6iOwivvXM z/qVUt6Okk0rKSz2/exl8AlIm7FLqPyQUAE+YpX2R1uRtOe9Y4RUrRtdVSQ6Wflf Yl0RclBBKbjmdjYkD3CCGy1naaL/dmme1yO19ROn7XUvH0Me9Jp9R7VbNtPU/B1g KurKTjBXFGcryV9f2oiHiQBGBBgRAgAGBQI3934iAAoJEETEF3mbcngCIeAAniUB BiP9kwm2XjnBz54di3iM+vX+AJ96motDnkGXRYCFsi0kt+xBccjCKg== =v/+c -----END PGP PUBLIC KEY BLOCK-----
- Save this Public Key to your hard drive as the persons name, like: "John Smith.asc"
- In your PGP software look for a menu labeled "Keys"
- "Import" the file, example: "John Smith.asc"
- That is it.
- Now when you receive email from a person you have imported the Public Key from, chose "Decrypt" from the PGP software and enter your "passphrase" to read it.