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We provide a treasure chest analogy to explain how asymmetric cryptography works. If Bob wants people to be able to send him messages secretly, he can ask them to put these messages inside of a treasure chest, and give him the treasure chest. Then he can open the treasure chest. Imagine that Bob can go to some public area such as a park and leave as many open treasure chests as he wants. When people want to send Bob a message, they can put the message into the chest and close it. Anyone is able to lock the treasure chest just by closing it. Bob can come to the park at some point and look at which treasure chests have been locked. Bob has a key that he can use to unlock the treasure chests to retrieve the private messages that people left for him. This basic idea is summarized in the following illustration. In essence, in asymmetric cryptography, when Bob gives out his public key, it is like him giving out an open, empty treasure chest. Anybody can put a message in the treasure chest and lock it by encrypting with Bob s public key. Bob is the only one who can open the treasure chest because his private key is the key to the treasure chest. When Bob does a decryption with his private key, it corresponds to unlocking the chest.

We could add a property to the Truck to get and set that (modeling a particular coil of hose being connected to the hose system on the truck):

public Hose Hose { get; set; }

This is another kind of composition relationship one component of the Truck is a hose, and the truck certainly can t be a part of the hose; but the containing object (the truck) no longer controls the creation and lifetime of its own piece of apparatus. Instead, we say that it aggregates the hose. Of course, there are no hard-and-fast rules about these terms and the code you write; they are just concepts which we use when we are designing systems. The definitions we ve used come from the Unified Modeling Language (UML) 2.0, and we re just mapping them to C# language features.

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Click the OK button, and the Web Site Already Exists dialog box should appear (see Figure 8-13). By default, the Select a new folder to create your Web site option is selected. We don t want to do this, because it will create a new folder underneath the root folder (i.e., BlockSDK\Tester\Tester). Select Open the existing Web site , because we want to use the Tester root folder as our web site.

Nonetheless, it is useful to have a common conceptual language for describing our systems and the common characteristics of the code we use to implement them. Equally, when you are looking at someone else s code (remembering that someone else includes past you ) it is helpful to be able to translate what was written into these standard modeling concepts. So we have a software model of the Firetruck, which has a Ladder and a Hose and uses a Firefighter as its Driver. What about the fire chief The fire chief is just another firefighter. He can drive a truck. He can put out fires. But he can do other stuff too. For instance, he can delegate responsibility for putting out a fire to another firefighter. The question we ask ourselves is this: is the FireChief a Firefighter with extra responsibilities If the answer is yes, we are describing an is-a association (the FireChief is a Firefighter) which we can represent by an inheritance relationship.

We ll get into the nuances of the question in the preceding paragraph in a minute, but let s assume for the time being that our answer to the question is yes (which, on face value, seems reasonable). Example 4-3 shows how we use inheritance in C#.

To extend the notation first described in Section 12.1.2 for asymmetric cryptography, we introduce two keys: kp and ks, which are the public and private (or secret) keys, respectively. An encryption function takes a message and the public key as input to produce ciphertext: F(m,kp) = c. The decryption function takes the ciphertext and private key as input, and produces the plaintext: F 1(c,ks) = m. An asymmetric cipher, then, is an encryption and decryption function for which F 1(F(m,kp),ks) = m. The cipher is asymmetric because different keys are used for encryption and decryption.

class FireChief : Firefighter { public void TellFirefighterToExtinguishFire (Firefighter colleague) { colleague.ExtinguishFire(); } }

Notice that we use the colon in the class declaration to indicate that FireChief is a Firefighter. We then say that Firefighter is a base class of FireChief. Looking at the relationship from the other direction, we can also say that FireChief is a derived class of Firefighter. We ve added the extra function that allows the chief to tell a firefighter to extinguish a fire which encapsulates that extra responsibility. What we haven t had to do is to duplicate all the functionality of the firefighter; that comes along anyway. We can now use the fire chief just as we would a firefighter, as shown in Example 4-4.

Firetruck truckOne = new Firetruck(); FireChief bigChiefHarry = new FireChief { Name = "Harry" }; truckOne.Driver = bigChiefHarry; bigChiefHarry.Drive(truckOne, new Point(100,300));

Firefighter joe = new Firefighter { Name = "Joe" }; bigChiefHarry.TellFirefighterToExtinguishFire(joe);

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