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Table 4-4. gpg Symmetric Encryption Options
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-a --cipher-algo name --version -o file -v
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Creates ASCII armored output. Uses a particular cipher algorithm. Displays the list of available cipher algorithms. Writes the output to the specified file. Enables the verbose mode. Uses twice to increase the verbosity.
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The first option, -a, provides gpg with ASCII armored output. The current test.txt.gpg file is not very screen friendly and contains a number of characters that cannot be displayed on the screen. If you wanted to send this file via e-mail to someone else, you would need to send it in the form of a file attachment, as it could not be placed inline in the message body of an e-mail. If you had specified the -a option, then gpg would have produced a file called test.txt.asc, which would be the same encrypted data but in ASCII armored format. Listing 4-19 shows what this file looks like. Listing 4-19. test.txt.asc -----BEGIN PGP MESSAGE----Version: GnuPG v1.2.3 (GNU/Linux) jA0EAwMCzuPpG+gDJnJgyUdnUU8TxWy4oA0S4dPErY+4jPt6YasKHUxkw0AoXNdH G/yXyQOrqitmGXc3ojfbSLGGaUN0A6NPh/GOTXcJiIR5/v8WG+Bj9A===/keh -----END PGP MESSAGE----This message can be pasted into the body of an e-mail and then cut out of it by the recipient and decrypted (or automatically decrypted if you had a GnuPG or PGP plug-in for your mail client). This is a much friendlier way of outputting encrypted data, and I recommend you use this. The next option, --cipher-algo, allows you to specify the cryptographic algorithm to use for encrypting your data. Symmetrical encryption using gpg can be done with a variety of different cryptographic algorithms depending on which you have installed on your distribution. You can display all the available algorithms by running gpg with the --version option. puppy# gpg --version gpg (GnuPG) 1.2.3 Copyright (C) 2003 Free Software Foundation, Inc. This program comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under certain conditions. See the file COPYING for details. Home: ~/.gnupg Supported algorithms: Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA, ELG Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH Hash: MD5, SHA1, RIPEMD160, SHA256 Compression: Uncompressed, ZIP, ZLIB
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By default gpg installations will use 3DES as the cipher algorithm, but you can override this using the --cipher-algo option, like this: puppy# gpg -c -a --cipher-algo BLOWFISH test.txt The previous line encrypted the test.txt file with the Blowfish cipher. The file outputted by the command would remain test.txt.asc (.asc because you used the -a option). The -o option allows you to specify the name of the file that will be outputted when the gpg -c command is run. For example: puppy# gpg -c -a -o test2.encrypted test.txt The previous line would output a file called test2.encrypted that contains the encrypted contents of the test.txt file. The last option, -v, enables verbose output from the encryption process. You can enable it twice, -vv, to provide even more detail.
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When your system starts, each of your file systems is mounted to allow you to access the data stored on your system. Your file systems can be mounted using different options: ranging from the ability to write to a file system to specifying what sort of files can be run on that file system. These options allow you to lock down the capabilities and functionality of each of your file systems. These options are controlled by the /etc/fstab file. This section is not going to be a definitive breakdown of every setting in the fstab file (the man page will give details of the settings I don t cover), but it will cover several settings you can use to ensure your file systems are mounted more securely. In Listing 4-20 you can see a sample of the /etc/fstab file. The /etc/fstab file is generally similar across most distributions. Listing 4-20. /etc/fstab File LABEL=/ LABEL=/boot none none none none /dev/hda3 /dev/cdrom / /boot /dev/pts /dev/shm /proc /sys swap /mnt/cdrom ext3 defaults 1 1 ext3 defaults 1 2 devpts gid=5,mode=620 0 0 tmpfs defaults 0 0 proc defaults 0 0 sysfs defaults 0 0 swap defaults 0 0 udf,iso9660 noauto,owner,kudzu,ro 0 0
Each line in the /etc/fstab file is an entry defining a file system that can be mounted. Each line consists of columns that define various facets of the file system. Let s quickly look at each column and what it does. The first column is the name or label of the file system to be mounted. This is generally a device name, such as /dev/cdrom, or a volume label, such as / for the root volume or /boot for the boot volume. The second column is the mount point for the file system. This is the directory or location on your system where you want to mount the file system. The third column is the type of file system that you are mounting (for example, ext3 or swap).
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