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Some items in this book will require the superuser, often referred to as the root user, to be enabled. The root account is disabled by default (for a reason) and has unbridled access to everything on the computer. This level of access is different from the level of access an administrative user has. For example, while logged in as a root user, one can incorrectly type commands that can erase important files in the operating system. Root is rarely required as a permanently accessible user account. Unless you are using the root account for specific tasks, such as running Carbon Copy Cloner, disable it for the majority of the time. To enable the root account, follow these steps: 1. 2. 3. 4. 5. Open the Directory Utility located in the /System/Library/CoreServices/ folder. Click the lock icon to authenticate as an administrator. Click the Edit menu, and select Enable Root User from the menu (see Figure 3 5). Once you ve enabled root, make sure to change the root password by clicking on Change Root Password in the same menu. Save the settings by closing the Directory Utility.

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.

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Forgotten debugging routines that can be exploited Remotely triggered applications running in the background of a system used to remotely execute code Attacks against backup systems

Figure 17-5. Setting the MultiLine property using the Smart Tag of the TextBox control 5. Now click outside the TextBox on the form itself to retain the new size the MultiLine property has given to the TextBox by default. If you want, you can also use the handles (the small three rectangles on each border line) to resize the TextBox control.

Figure 6-1. .NET Service Bus concept The core and essential part of .NET Service Bus uses globally addressable Internet access based on REST or SOAP. All endpoints, resources, and applications provide a URI for access. The Internet services provided by .NET Service Bus cover the following three major categories: Service name hierarchy system Service registry and publishing Endpoint relay connectivity

You ll find the Dictionary program on the Applications Accessories menu. Type the word in the Look Up text box at the top of the window, and its definition will appear in the area below, as shown in Figure 11-13. As soon as you start typing, the program will begin to look up the word in the dictionary, and this can cause a momentary delay before the letters appear on your screen.

The SiteMapPath control displays a link to the end user s current page and a hierarchal path back to the root of the web application. This functionality is oftentimes referred to as a breadcrumb trail for the end user.

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