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Both protected internal and internal are much underused access modifiers. They are a very convenient way of hiding away library implementation details from your consumers, and reducing the amount of documentation and surface-area testing you need. I suspect that they are unpopular (as with most hidden by default or secure by default schemes) because they can sometimes get in your way. There are a fair number of implementation details of classes in the .NET Framework that are internal (or private) that people would very much like to access, for example. A common reason for taking something useful and applying the inter nal modifier is that it was not possible to fully document (or understand the full implications of) the hook this would provide into the framework. And rather than open up potential security or reliability problems, they are marked internal until a later date: perhaps much, much later, tending toward never. Although there is an intention to revisit these things, real-world pressures mean that they often remain unchanged. This is another example of the lock down by default strategy which helps improve software quality. That doesn t make it any less irritating when you can t get at the inner workings, though!

So we ll mark those methods in the base class virtual and protected, as shown in Example 4-10.

protected virtual void TurnOnHose() { Console.WriteLine("The fire is going out."); } protected virtual void TrainHoseOnFire() { Console.WriteLine("Training the hose on the fire."); }

We can now create our TraineeFirefighter class (see Example 4-11).

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Alice could simply encrypt the message she would like to send to Bob with his e-mail address In this case, Bob s e-mail address is both his identity and his public key To decrypt the message, Bob retrieves his private key from a private key generator (PKG) run by his company (learnsecuritycom), and applies his private key to the encrypted message To successfully retrieve his private key, Bob authenticates to the PKG in much the same way that he would with a CA However, in IBE, the PKG (in addition to Bob) knows his private key Dan Boneh and Matt Franklin s Identity-Based Encryption from the Weil Pairing, describes a practical implementation of such an identity-based encryption scheme Their scheme has been commercialized by Voltage Security (wwwvoltagecom), a startup company founded in 2002 Revocation works differently in IBE than in traditional PKI.

class TraineeFirefighter : Firefighter { private bool hoseTrainedOnFire; protected override void TurnOnHose() { if (hoseTrainedOnFire) { Console.WriteLine("The fire is going out."); }

else { } }

Console.WriteLine("There's water going everywhere!");

}

In traditional PKI, the CA publishes a CRL Over time, the length of a CRL grows, and must be downloaded before encrypting or verifying a signature to avoid using a revoked public key In IBE, if we make the public key Bob s e-mail address concatenated with the current date (bob@learnsecuritycom || current-date), then the PKG simply will not provide Bob private keys corresponding to the public keys for those dates after which his key is revoked..

protected override void TrainHoseOnFire() { hoseTrainedOnFire = true; Console.WriteLine("Training the hose on the fire."); }

The test harness is bare bones and nothing fancy. It has a text box at the top, a Run button, and an option box labeled Show errors here . Before we dig into the details, let s make something happen. Below the text twitter = new TwitterClass() type twitter. getLatestPosts(). Click the Run button, and after a few moments, content should appear below the text box, as shown in Figure 8-19.

As you can see, the trainee is derived from Firefighter. We added an extra Boolean field to keep track of whether the trainee has actually trained the hose on the fire, and then provided our own implementations of TrainHoseOnFire and TurnOnHose that make use of that extra field. This is intended to model the detailed but slightly peculiar and occasionally erratic way in which the trainee follows the instructions for these operations in his copy of How to Be a Firefighter, rather than allowing common sense to prevail. We also need a quick update to our main function to use our trainee. Let s add the following code at the end:

// A reference to Bill, the trainee Firefighter bill = new TraineeFirefighter { Name = "Bill" }; bill.ExtinguishFire();

If we compile and run, we see the following output:

Joe is putting out the fire! Training the hose on the fire. The fire is going out. Bill is putting out the fire! Training the hose on the fire. The fire is going out.

Recall that for the purposes of preventing XSRF and XSSI attacks, it is not feasible to rely on Referer headers because they are not always present, and at the same time can in certain circumstances be suppressed by a malicious site (see Section 10.3). However, for limiting bandwidth leeching, it is sufficient. It is generally not possible for a page to include an image, script, or style sheet, and suppress the Referer in the resulting request; at the same time, most users browsers will send Referer headers. A third party that relies on our resource would only work for users whose browsers or proxies suppress Referer headers, which makes it impractical for them to do so. And even if a few requests slip through, we are only exposed to a small fraction of the cost we could otherwise expect.

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