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audits performed by Nessus are coded as plug-ins. In order to download plug-ins, you ll need to register for either the HomeFeed or the ProfessionalFeed. The HomeFeed is free, but can only be used by home users. If you re planning on using Nessus for professional or government use, you ll need to purchase the ProfessionalFeed. When you register for a feed, an activation code will be emailed to you. NOTE: An older version of nessus that does not require a registration key is available via MacPorts. During the install, it gives you the option to choose whether you want the server to start when the system boots or whether you want to start it manually. If the system is a dedicated Nessus server, then you will want the Nessus daemon to launch at boot. Otherwise, it s better to launch manually as needed, especially if Nessus is installed on a laptop (it can be a sizeable resource hog). After installation, launch the Nessus Server Manager application, enter your activation code and click Register. Once your copy of Nessus is registered, you ll be able to start the Nessus Server (see Figure 17 3).

2. 3.

Before you can log into Nessus, you ll have to create a user. In the Nessus Server Manager, click on Manage Users, and add a user. Now, open a web browser and go to http://localhost:8834 (double-click on the Nessus Client.url that was installed with the

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Encryption and decryption are useful when you want to protect an entire chunk of data so nobody else can read it. Sometimes, however, that s more protection than you really need. Suppose your weather-predicting server sent messages to the BlackBerry telling it whether or not it will rain tomorrow. You don t really care if someone else intercepts that message; however, you still worry about another situation. What if a rival programmer starts sending messages to your users, claiming that tomorrow will bring a rain of frogs Your users will get upset and delete the app. What you re really looking for in this situation is some way that you can determine the authenticity of a message. How can you be sure that this data came from your server and nobody else has tampered with it You can best accomplish this goal by using a checksum, also known as a hash or a digest. A checksum is a formula that looks at all the data in your message, applies an algorithm over it, and then generates a hash representing that algorithm s result, as shown in Figure 5-2. Checksums run over the plain messages protect against inadvertent errors that may occur during transmission. To protect against intentional attacks, you can add a secret key to the end of the message, and then find the hash value generated by the combination of the message and the key. Using this method, you can pass the entire message through in unencrypted format, which allows for faster processing, and still protect against tampering. This process is sometimes referred to as cryptographic signature, or more informally, signing. The signature is proof of authorship without the overhead and inconvenience of full encryption.

cmd.CommandText = "select value c from EFRecipesEntities.Customers as c"; using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess)) { while (reader.Read()) { Console.WriteLine("{0}'s email is: {1}", reader.GetString(1), reader.GetString(2)); } } } The following is the output from the code in Listing 3-3: Customers... Robert Stevens's email is: rstevens@mymail.com Julia Kerns's email is: julia.kerns@abc.com Nancy Whitrock's email is: nrock@myworld.com

Server Manager). Log into the client with the user account you just created, and you will see the Reports view. Because we haven t scanned anything yet, there aren t any reports to view. In order to scan a target, you ll need to define a policy. A scanning policy defines options like types of scan and range of ports to use, and also which plug-ins to use. Each plug-in typically corresponds to a specific vulnerability. Enabling fewer plug-ins will speed up scans, since the scanner will not take the time to perform disabled probes. For example, if you re scanning a Mac OS X Server system, you can probably disable the Cisco plug-in family. NOTE: Care should be taken with disabling plug-ins. If you disable a scan for a vulnerability that actually exists on one of your systems you could inadvertently leave an exploitable vulnerability on your system. To define a policy, click on Policies, and then click Add. Under General, give your policy a name and select your scanning options. The Credentials tab lets you enter user credentials for the system to be scanned. Nessus will use those credentials to check for vulnerabilities that can be exploited by valid users. The Plug-ins tab is where you can enable or disable the plug-ins, and the Preferences tab lets you configure some options for enabled plugins. See Figure 17 4.

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