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Data padding is a cryptographic technique used by asymmetric algorithms to protect against attacks that rely on the unencrypted text being simple. The .NET Framework supports two padding schemes for the RSA algorithm: Optimal Asymmetric Encryption Padding (OAEP) and PKCS #1 v1.5. Generally, use OAEP, because it is newer and more secure than PKCS. Use PKCS only when you are communicating with a legacy client that you know does not support OAEP. Currently, all Windows operating systems released prior to Windows XP lack support for OAEP, including Windows 2000. The most challenging aspect of encryption is converting data into the byte array format. To convert strings to byte arrays, use the System.Text.Encoding.Unicode.GetBytes and System.Text.Encoding.Unicode.GetString methods. For example, the following console application encrypts a string using PKCS#1 v1.5 data padding, and then immediately decrypts and displays the string:

Monitoring SMTP protocol logs lets you determine whether problems are occurring with the SMTP protocol that enables users to send e-mail messages. However, to check client connectivity, you also need to test that users can receive e-mail messages by using POP3 or IMAP4 clients. Earlier in this lesson, you saw how you could enable POP3 and IMAP4 on an Exchange Server 2007 server that has the Client Access role installed. You can check whether the services are running on a server by using the PowerShell commands Get-Service MSExchangePop3 and Get-Service MSExchangeImap4. Figure 10-34 shows the output from these commands. On the client side, you can use PowerShell commands based on the Set-CASMailbox cmdlet to enable or disable POP3 and IMAP4 for a specified mailbox. For example,

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Lessons in this chapter:

Sensitive information is not saved in the package at all. Each time the package is reopened in BIDS, the connection passwords must be reentered. For package execution, the password needs to be stored in a package configuration or passed to the package through the command-line setting. This is the recommended setting if you are exclusively using Windows Authentication for your connections. The entire package is encrypted with a password that is set in the PackagePassword property. To open the package in BIDS, you need to enter the correct package password, and the package cannot be executed without passing the password to the package at execution.

Failover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

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In this lesson, you will learn the meaning of the term authentication and how it differs from authorization. You will then learn how to implement and analyze both authentication (checking a user s identity) and authorization (verifying a user s right to access resources). You can use the techniques described in this lesson to protect portions of your code from unauthorized use, so that only specific users or members of specific groups can run an assembly, method, or code segment. If your organization uses Active Directory or local user databases, you can integrate your application s authorization controls into your existing directory service using the WindowsIdentity and WindowsPrincipal classes. You can also build your own authentication system or integrate into a non-Microsoft directory service. For straightforward user databases, you can use the GenericIdentity and GenericPrincipal classes. If you need complete control over users and roles, you can implement the IIdentity and IPrincipal interfaces.

Windows 7 Power Configuration Power plans are collections of settings that specify how a computer running Windows 7 uses energy. A new computer running Windows 7 comes with three power plans named High Performance, Balanced, and Power Saver. Many original equipment manufacturers (OEMs) also supply their own custom Windows 7 power plans that they may precisely optimize for a specific hardware configuration. In general, the High Performance power plan allows hardware to run at its maximum speed but uses more energy, and the Power Saver plan configures hardware devices in such a way that they use less energy with a corresponding reduction in performance. When a portable computer is running on battery power, it runs for a shorter amount of time before the battery drains completely when configured to use the High Performance power plan compared to when the same computer is set to use the Power Saver power plan. You can use the Power Options control panel, shown in Figure 11-26, to select a power plan for a client running Windows 7. The default power plan for a newly installed client running Windows 7 is Balanced.

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