PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Using Encryption in PHP
423
and create a file named test.txt.asc. If you open test.txt.asc, you should see an
encrypted message like this:
-----BEGIN PGP MESSAGE-----
Version: GnuPG v1.0.3 (GNU/Linux)
Comment: For info see http://www.gnupg.org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=gfQu
-----END PGP MESSAGE-----
You should be able to transfer this file to the system where you generated the key initially
and run
gpg test.txt.asc
to retrieve your original text.The text will be written to a file with the same name as it
had before—in this case, test.txt.
To have the text echoed to the screen, use the -d flag:
gpg -d test.txt.asc
To place the text in a file of your choice rather than the default name, you can use the -
o flag as well and specify an output file like this:
gpg –do test.out test.txt.asc
Note that the output file is named first.
If you have GPG set up so that the user your PHP scripts run as can use it from the
command line, you are most of the way there. If this setup is not working, see your system
administrator or the GPG documentation.
Listings 18.1 and 18.2 enable people to send encrypted email by using PHP to call
GPG.
Listing 18.1
private_mail.php— The HTML Form to Send Encrypted Email
Send Me Private Mail