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One other thing: if we re creating an abstract base class, we usually name it something such as FooBase to distinguish it from a regular class. This is by no means a hard-andfast rule, but it is pretty common. So let s rename Firefighter to FirefighterBase, and make sure we change it where it is referenced elsewhere on the Firetruck, FireChief, and TraineeFirefighter classes. The easiest way to do that is to use the automatic rename refactoring in the IDE. Just type over the old name in the declaration, click on the Smart Tag that appears, and choose Rename Firefighter to FirefighterBase from the menu. You could do it by hand if you wanted, though. The whole purpose of this was to get rid of the default implementation we have for putting out fires, so let s turn Firefighterbase.ExtinguishFire into an abstract method. Just like the modifier for the class, we use the abstract keyword, but this time we also remove the method body and add a semicolon at the end of the declaration:

abstract class FirefighterBase { public abstract void ExtinguishFire(); }

s Caution In the following example, as well as some other examples presented in later chapters, the simple toy protocols that we discuss are for instructive and illustration purposes only. They are designed to make concepts easy to understand, and are vulnerable to various types of attacks that we do not necessarily describe. Do not implement these protocols as is in software.

If you try building again now, you can see that we have a new compiler error:

'TraineeFirefighter' does not implement inherited abstract member 'FirefighterBase.ExtinguishFire()'

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Remember, we are required to override an abstract method; our class isn t finished until we do so (unlike a virtual method, where we are invited to override it, but it will fall back on the base if we don t). While our FireChief does override the method, our TraineeFirefighter doesn t. So we need to add a suitable implementation:

class TraineeFirefighter : FirefighterBase { // Override the abstract method public override void ExtinguishFire()

{

Let s consider a scenario in which Bob has a public/private key pair, and Alice wants to authenticate Bob. Assuming that Alice received Bob s public key certificate and trusts that, say, Kp, is indeed Bob's public key, she can encrypt a challenge message using Bob s public key (see Figure 13-1).

}

// What are we going to put here } // ...

But what are we going to put into that ExtinguishFire override Before, we depended on our base class for the implementation, but our base is now abstract, so we don t have one available anymore! That s because we ve forgotten about our regular Firefighter. Let s add a class for him back into the hierarchy:

If you need to refresh your memory about how blocks are structured, refer to 7. The Twitter.js code is shown in Listing 8-1 for your reference.

class Firefighter : FirefighterBase { public override void ExtinguishFire() { Console.WriteLine("{0} is putting out the fire!", Name); TurnOnHose(); TrainHoseOnFire(); } }

Notice we ve given him the standard firefighter implementation for ExtinguishFire. If we take one more look at the base class, we can see that we still have those two virtual implementation helpers. While everything builds correctly at the moment, they don t really belong there; they are really a part of the Firefighter implementation, so let s move them in there. We end up with the code in Example 4-13.

Figure 13-1. Authentication with encryption The challenge message contains a nonce (some random number) in it. In Figure 13-1, Alice encrypted the number 384764342 with Bob s public key and sent the nonce to Bob. Bob can use his private key to decrypt the message to retrieve the plain text 384764342, and send it back to Alice. Since Bob is the only person who can decrypt this message with his private key, Alice can be satisfied that she is communicating with Bob if he can respond with the nonce that she encrypted with his public key. An impostor such as Mallory would not possess Bob s private key and would not be able to decrypt the challenge. Obviously, Alice should send a different, unpredictable nonce each time, or else Mallory may be able to replay a message that Bob previously decrypted to impersonate him. In this example, we have used public key encryption to achieve authentication. Encryption can also be used to implement digital signatures and message integrity, among other things. In 15, we show how encryption can be used to implement digital signature schemes and message authentication codes.

abstract class FirefighterBase { public abstract void ExtinguishFire(); public string Name { get; set; } public void Drive(Firetruck truckToDrive, Point coordinates) { if (truckToDrive.Driver != this) { // We can't drive the truck if we're not the driver return; } truckToDrive.Drive(coordinates); }

}

class Firefighter : FirefighterBase { public override void ExtinguishFire() { Console.WriteLine("{0} is putting out the fire!", Name); TrainHoseOnFire();

}

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