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For instance, if Alice sends a personal message to Bob, Carol might be able to intercept that communication and decrypt it because the key is public If Bob wants to receive confidential.

We have a model of the Firetruck, which uses a Firefighter as its Driver. The truck can be instructed to drive somewhere (if it has a driver), and you can tell a Firefighter to drive the truck somewhere (if he is the designated driver). You can think of this as modeling a relationship between a Firetruck and its Driver. That driver has to be a Firefighter. In object-oriented design, we call this relationship between classes an association.

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An association is a kind of flexible, arms length relationship between two entities in the system. There are no particular constraints about the direction of the relationship: the firefighter can be associated with the truck, or the truck with the firefighter. Or both. Any particular firefighter may have associations with other types, and we can always assign another driver to the fire truck; there s no exclusivity. For instance, we can do something like this:

Selecting that menu item opens the New Web Site dialog box (shown in Figure 8-12). The Popfly Block SDK is written using the .NET language called C# (say C Sharp ). It is a powerful language that is very similar to JavaScript. Once again, there are entire books written about C#, so I won t go into that here. Just understand that, in order for the test harness to run properly, the language of the project must be set to C#. Select Visual C# as the language of the site. Select Empty Web Site from the Visual Studio Installed Templates section of the dialog box. Set the Location to File System. Click the Browse button, and select the directory of the block SDK. In my case, it is located on I:|\Book Writing\Apress\ Foundations of Popfly\BlockSDK\Tester with BlockSDK\Tester being the root directory of the test harness shown in Figure 8-12.

Firetruck truckOne = new Firetruck(); Firefighter joe = new Firefighter { Name = "Joe" }; Firefighter frank = new Firefighter { Name = "Frank" }; truckOne.Driver = joe; // Later... truckOne.Driver = frank;

But what about the 30 foot retractable ladder that we happen to have on the fire truck; what kind of relationship exists between the ladder and the fire truck Here s our ladder class:

class Ladder { public double Length { get; set; } }

messages from both Alice and Carol such that only he can decrypt these communications, he would need two symmetric keys. He would share one of these keys with Alice, and the other with Carol. If Bob were seeing another woman, Denise, then he would have to share a third key with her. Unfortunately, Bob would somehow need to agree with Alice, Carol, and Denise on keys. Asymmetric key cryptography, however, allows us to solve this problem without requiring Bob to agree upon different keys individually with Alice, Carol, and Denise. In an asymmetric scheme, Bob has two keys: a public key and a private (or secret) key. Bob publishes his public key in the directory. Alice, Carol, and even Denise can send confidential messages to Bob by encrypting them with his public key. Due to the way asymmetric key cryptography works, when Alice sends Bob a message encrypted with his public key, neither Carol nor Denise can decrypt that message. Using Bob s private key is the only way to decrypt the message. Since Bob keeps his private key secret, only he can decrypt messages that people send him that are encrypted with his public key. Once Bob publishes his public key in a public directory, Alice and Carol can look up that key and use it to encrypt and send confidential messages to Bob. Anyone could look up Bob s key in the directory to send him a confidential message. Only Bob would be able to decrypt these messages.

This particular ladder is one of those powered, extensible rotating things that are built right into the truck. So let s add a property to represent that (see Example 4-2).

class Firetruck { public Firefighter Driver { get; set; } readonly Ladder ladder = new Ladder { Length = 30.0 }; public Ladder Ladder { get { return ladder; } } } // ...

When we construct the Truck, it creates a 30-foot ladder for itself, with a read-only property to retrieve it. We call this made of association between classes composition. The ladder is a builtin part of the fire truck, but the fire truck can never be a part of the ladder, and the truck itself is responsible for the life cycle of its own ladder. What if we need to manage other equipment on the truck a detachable coil of hose, for example:

class Hose { }

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