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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.

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Listing 1-11. Relational Calculus to Retrieve Senior Members {m | Member(m) and m.MemberType = 'Senior'}

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.

To decrypt e-mail received from other people, your PGP key needs to be configured in Seahorse. You will need to use your key to decrypt the e-mail. Just select the e-mail message you want to decrypt, and you will see the Enter Passphrase dialog box. Enter the password to your PGP key and click OK. You will now be able to view the e-mail in plain text form.

198.41.0.4 192.228.79.201 198.32.64.12 202.12.27.33

As you start to understand how Ubuntu works, you ll become more and more aware of commonsense methods that will protect your system. However, we ll outline a few of these now to get you started: Entering your password: Be very wary if you re asked to enter your password (outside of initial login, of course). You ll be asked to provide your password when following many of the configuration steps within this book, for example, and this is acceptable and safe. But if you re asked to do so out of the blue, you should be suspicious. If the root password prompt dialog box (shown in Figure 8-14) appears when you run a file that shouldn t really need root permissions, such as an MP3 or OpenOffice.org file, you should treat the situation with caution. Creating perfect passwords: Setting up good security inevitably involves having a good, strong password. The challenge is to create something easy to remember but hard to crack, so it should involve punctuation, numbers, and an assortment of uppercase and lowercase letters. Perhaps you could base a password on a favorite song. For instance, TiaLTNGO@TQiD1986-4:02 is a great password. To remember it, I just need to know that There is a Light That Never Goes Out was a track on The Queen is Dead released by The Smiths in 1986, and it was 4 minutes and 2 seconds long. In contrast, password, password4, and andy1302 are poor because they are open to dictionary attacks, in the case of the first two, or personal information attack in the third case.

As you ve seen in this book, you often have many equivalent ways of expressing a query in SQL. Some are based on the relational calculus; others use explicit algebra operators such as inner join and intersect. Listings 9-7, 9-8, and 9-9 show three different ways to express the same simple join and select operations to find the tournaments entered by senior members.

Installing new software: Be careful in choosing programs to download and install. Because Linux works on the basis of open source code, theoretically, anyone can tamper with a program and then offer it for download by the unwary. This rarely happens in real life. Even so, it s wise to avoid downloading programs from unofficial sources, such as web sites you find online via a search engine and whose authenticity you cannot totally trust. Instead, get software from the web site of the people who made it in the first place or, ideally, from the official Ubuntu software repositories (discussed in 20).

Query time: 81 msec SERVER: 198.41.0.4#53(a.root-servers.net.) WHEN: Sun Feb 1 11:27:14 2004 MSG SIZE rcvd: 436