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// A reference to Joe, Harry's number one Firefighter joe = new Firefighter { Name = "Joe" }; // Firefighter harry is really a firechief, with joe as his NumberOne FireChief harry = new FireChief { Name = "Harry", NumberOne = joe }; Firefighter harryAsAFirefighter = harry; // Harry is just a firefighter, so he can extinguish fires // but as a firechief he gets joe to do the work harry.ExtinguishFire(); // While as a firefighter he does it himself harryAsAFirefighter.ExtinguishFire();

The output we get now looks like this:

Joe is putting out the fire! Harry is putting out the fire!

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Since RSA has been around longer than ECC, and mathematicians have had more time to look at attacks on RSA (Boneh 1999), we might say that RSA is better understood than ECC. Nevertheless, ECC has started making an impact in real-world security systems. For example, NIST, ANSI, and IEEE have standardized how ECC should be used for government, financial, and other types of systems. Also, while Certicom holds many patents surrounding ECC, NSA has purchased a blanket license for the use of ECC in protecting government information. The mathematics of ECC, as with RSA, are beyond the scope of this book. (Cryptography and Network Security: Principles and Practice, by W. Stallings, is a good source to learn about the mathematics of both RSA and ECC.) The key characteristic of ECC-based public key cryptography that is important from a systems standpoint is that it allows you to do public key operations using much smaller keys than RSA.

When we talk to our Harry object through a FireChief reference, he gets Joe to put out the fire. If we talk to the object through a Firefighter reference, he does it himself. Same object, but two completely different implementations. Why might we want to do that Let s say we had multiple fire chiefs on a job, but it is our policy that a chief acting as another chief s Number One is not allowed to delegate the job again. Our code models exactly this behavior, as shown in Example 4-7.

Of course, whether that s desirable behavior is another matter entirely we ve ended up with such radically different approaches to putting out a fire that it might be better to separate them back out into functions with different names. When you go through a refactoring process such as this, it is a good idea to check that you re still happy with the semantic implications of your code. Ideally, you want to end up with a neat design, but a superficially neat design that makes no sense is not helpful.

// A reference to Joe, Harry's number one Firefighter joe = new Firefighter { Name = "Joe" }; // FireChief harry has joe as his NumberOne FireChief harry = new FireChief { Name = "Harry", NumberOne = joe }; FireChief tom = new FireChief { Name = "Tom", NumberOne = harry }; // Harry is just a firefighter, so he can extinguish fires // but as a firechief he gets joe to do the work harry.ExtinguishFire(); // But if Tom is asked to extinguish a fire, he asks Harry to do it // Our policy dictates that Harry has to do it himself, not delegate to // Joe this time. tom.ExtinguishFire();

Harry delegates to Joe when he is asked to do it himself, because we are calling through a reference to a FireChief. Tom is also a FireChief, and we are calling through a reference to him as a FireChief, so he delegates to Harry; but when Harry is asked to do it in his role as a Firefighter (remember, the NumberOne property is a reference to a Firefighter), he does it himself, because we are now calling the method through that reference typed to Firefighter. So our output looks like this:

Now that we have the project set up, let s start the block test harness. First, make sure the test harness s default page starts up in the web browser by right-clicking Default.aspx (see Figure 8-16) and selecting Set As Start Page. Similar to index.htm pages, default.aspx pages are .NET pages that are started up by web sites when you navigate to a URL. Since you are using a development tool, though, you have complete control over what is started first by the internal web server.

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