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When you consider client-based security, usually you must also consider Secure Multipurpose Internet Mail Extensions or S/MIME. S/MIME is a standard for public-key encryption and signatures of e-mail messages. Encryption is used to protect the content of a message so that only the intended recipients can read it. Signing a message means that the recipient can verify whether the message has been changed on the way from the sender to the recipient. S/MIME is a client-based encryption and signing protocol that provides end-to-end security from the sending mailbox to the receiving mailbox. Unlike other encryption protocols that are session-based on the transport layer (such as TLS), the message also remains encrypted and signed within the mailbox. Even administrators cannot decrypt it if their digital certificate does not allow them to do so. Implementing S/MIME offers the following abilities:

Use digital signatures as a way to prove to your communication partners that the content was not altered. Authenticate messages (especially for crucial functions such as when your boss approves your travel requests). Encrypt messages to prevent accidental disclosure of the content.

To support S/MIME in your Exchange organization, you must either have a public key infrastructure (PKI) available or your clients need to configure their certificates locally on each client (both their own and the public certificates from the person with whom they want to communicate securely).

ASP.NET MVC takes testability very seriously, and it shows in a number of ways. For example, ASP.NET MVC supplies abstract classes for the various ASP.NET intrinsic objects, including HttpContext, HttpRequest, and HttpResponse. Abstract classes come in two forms: a base class and a wrapper class. The base class (that is, HttpRequestBase) exposes the same interface as the intrinsic object it abstracts. It exposes only virtual members whose implementation invariably throws an exception. The corresponding wrapper class (that is, HttpRequestWrapper), instead, provides a concrete implementation of the base class. Such an implementation basically defines a thin layer around a wrapped object that can be the ASP.NET intrinsic object or, for testing purposes, a mock object. Here s an excerpt from the source code of the HttpRequestWrapper class:

Usage: D3DCOLORtoUBYTE4(x) Description: Swizzles and scales components of the 4-D vector x to compensate for the lack of UBYTE4 support in some hardware.

If you use Windows PKI, all public certificates of your users are stored in your Active Directory. This allows your users to securely communicate with each other internally. However, if your users often communicate with external partners, you can also make the partner s certificate available in Active Directory. You do this by creating a contact and then publishing the contact s public certificate to it. You can find more information in the Publish certificates for external contacts in Active Directory available at http://msexchangeteam.com/ archive/2008/04/23/448761.aspx.

and signatures. Unlike in previous versions where you had to configure every mailbox database, you do not need to configure any server-side setting to support S/MIME.

Because S/MIME provides end-to-end security, it is important that the e-mail application you use to read and write S/MIME messages meets the following two requirements:

public class HttpRequestWrapper : HttpRequestBase { // Fields private HttpRequest _httpRequest; // Ctor public HttpRequestWrapper(HttpRequest httpRequest) { if (httpRequest == null) throw new ArgumentNullException("httpRequest"); this._httpRequest = httpRequest; } // Public methods public override byte[] BinaryRead(int count) { return this._httpRequest.BinaryRead(count); } ... }

It must support S/MIME encryption and signatures. The digital signature must be configured in the e-mail application.

Outlook Web App running on a Windows system supports S/MIME. If you run OWA on a LINUX system, you do not have the S/MIME feature available and thus you cannot encrypt or decrypt S/MIME messages.

As you can see, any methods in the wrapper class end up invoking the same method on an underlying object injected via the constructor. Base and wrapper classes live in the System.Web.Abstractions namespace. Table 2-4 lists all classes in ASP.NET MVC that abstract native ASP.NET system objects.

Understanding Header Firewall: http://technet.microsoft.com/en-us/library/ bb232136.aspx Understanding Anti-Spam Stamps: http://technet.microsoft.com/en-us/ library/aa996878.aspx Sender Policy Framework Project Overview: http://www.openspf.org/ Sender ID Framework SPF Record Wizard: http://www.microsoft.com/mscorp/safety/ content/technologies/senderid/wizard/ Understanding Safelist Aggregation: http://technet.microsoft.com/en-us/library/ bb125168.aspx Publish certificates for external contacts in Active Directory: http:// msexchangeteam.com/archive/2008/04/23/448761.aspx

Usage: ddx(x) Description: Returns the partial derivative of x with respect to the screen-space x-coordinate.

Messaging Compliance Overview 346 Designing and Implementing Messaging Records Management 348 Designing and Implementing Transport Rules 361 367

Designing and Implementing Message Journaling Designing and Implementing Personal Archives Multi-Mailbox Search 373 Designing and Implementing AD RMS Integration

TABLE 2-4

380 399