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Encrypting a File
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To encrypt a file, follow these steps: 1. 2. Open your /home directory by clicking Places Home Folder.
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Select a file or folder that you want to encrypt. Right-click the selected item and select Encrypt , as shown in Figure 8-10.
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CHAPTER 8 HOW TO SECURE YOUR COMPUTER
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Figure 8-10. Encrypting a file or folder is a context menu option in Nautilus. 3. Select the recipients of the encrypted file, as shown in Figure 8-11. To encrypt a file for yourself, put a check alongside your own key. To encrypt for others, put a check alongside their names. Remember that file encryption is performed with the recipient s public key, so you will need to have imported it beforehand. Click OK to continue.
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Caution Remember that the persons you select will be the only ones able to decrypt the file. After the file is
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encrypted for someone else, you won t be able to decrypt it!
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If you selected to encrypt more than one file, the Encrypt Multiple Files dialog box will appear, as shown in Figure 8-12. You can opt to encrypt each file separately or have the multiple files packed together in an encrypted compressed file, with the compression type of your choice. Select your preferred settings and then click OK to continue.
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Figure 8-11. Select recipients of the files or folders you would like to encrypt from your created and imported keys.
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CHAPTER 8 HOW TO SECURE YOUR COMPUTER
Figure 8-12. If you are encrypting multiple files, you can opt to encrypt each file or store all files in a compressed file and have that compressed file encrypted. 5. After a file or folder has been encrypted, it will appear on your file system as a new file with a .pgp extension, as shown in Figure 8-13. This can then be passed on to your contact, if the file was encrypted with her public key, or filed away for storage if it was encrypted using your private key. For instructions on how to decrypt the file, see the following section.
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Figure 8-13. The encrypted file has the extension of .pgp.
Decrypting a File
To decrypt a file, do the following: 1. 2. 3. 4. 5. Open your /home directory by clicking Places Home Folder.
Select the file that you want to decrypt. The file extension is typically .pgp. Double-click the file. Type the passphrase that you entered when creating your key earlier. The file will then be decrypted in the folder where the encrypted file is stored. It will have its original filename.
Signing and Encrypting E-Mail
After you ve set up your encryption keys, you can send e-mail with your digital signature to signify the authenticity of your e-mail, as well as encrypt e-mail so that the intended recipient is the only one capable of reading your mail, and vice versa. As long as you ve configured your PGP key, imported keys to trust, and configured your Evolution account, integrating this kind of security is seamless.
CHAPTER 8 HOW TO SECURE YOUR COMPUTER
To sign and/or encrypt an e-mail message in Evolution, do the following: 1. 2. 3. 4. 5. In Evolution, choose File message. New Mail Message to compose a new e-mail
The Compose Message dialog box appears. Fill in the To field, Subject field, and the message. Click Security. To mark the e-mail for signing, select the PGP Sign check box. To mark the e-mail for encryption, select the PGP Encrypt check box. Click the Send button to send the e-mail. If you chose to sign the message, the Enter Passphrase dialog box appears. Enter the password you assigned when you created your PGP key and then click OK.
Your e-mail will be sent, signed, and encrypted as you specified.
Validating E-Mail
To be able to validate signed e-mail messages you have received from other people, you need to import their public keys and then trust them using Seahorse. When you receive signed e-mail messages, a note indicating the authenticity of the e-mail signature is placed at the very bottom of the message.
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