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OK, the idea here was to allow our production team to quickly configure a check to see if the process was likely to fail, before embarking on a resource-intensive task. Let s say DocumentProcesses.TranslateIntoFrench is a very time-consuming function, and they ve discovered that any document whose text contains a question mark ( ) will fail. They ve raised a bug with the machine translation team, but they don t want to hold up the entire production process until it is fixed only 1 in 10 documents suffer from this problem.

Figure 14-2. Man-in-the-middle attack Mallory can fool Alice into thinking that she has successfully participated in a key exchange with Bob, and fool Bob into thinking that he has successfully participated in a key exchange with Alice. The protocol starts off as before, with Alice choosing a secret random number, a. Alice sends ga to Bob, but Mallory intercepts it. Mallory chooses a secret random number, m, and sends gm to Bob instead of ga. Bob also attempts to engage in the protocol as expected: he generates gb and attempts to send it to Alice. Unfortunately, Mallory intercepts gb as well, and replaces it with gm, sending gm to Alice. Alice computes (gm)a, and Bob computes (gm)b. Mallory computes both (gm)a and (gm)b. As a result, Mallory will be able to see any message that Alice attempts to send to Bob

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They need to add a quick check to go with the TranslateIntoFrench process. It is only one line of code:

return !doc.Contains(" ");

They could create a static class, with a static utility function to use as their predicate, but the boilerplate code would be about 10 times as long as the actual code itself. That s a barrier to readability, maintenance, and therefore the general well-being of the developer. C# comes to our rescue with a language feature called the anonymous method.

An anonymous method is just like a regular function, except that it is inlined in the code at the point of use. Let s update the code in our Configure function to include a delegate to an anonymous method to perform the check:

using the secret key (gm)a. Mallory will also be able to see any message that Bob attempts to send to Alice using the secret key (gm)b. Mallory, as a man-in-the-middle, can impersonate both Alice and Bob. In some scenarios, however, it is possible to apply DH such that Alice and Bob can detect if there is a man-in-the-middle. Phil Zimmermann, in his Voice-over-IP (VoIP) protocol ZRTP , proposes that both parties compute the hash of the shared secret h((ga)b) that they are using (Zimmermann 2006). Both communication endpoints (e.g., phones) could display the hash. Should Alice want to verify that there is no man-in-the-middle, she could ask Bob to read the hash. Note that when Mallory is actively participating as a man-in-the-middle, the shared secret that Alice uses with Mallory (gm)a and the shared secret that Bob uses with Mallory (gm)b are different. Their hashes will also be different! If Bob reads a different hash value than what Alice expects, she knows there is a man-in-the-middle!4

rc.AddProcess( DocumentProcesses.TranslateIntoFrench, delegate(Document doc) { return !doc.Text.Contains(" "); });

The delegate to the anonymous method (i.e., the anonymous delegate) is passed as the second parameter to our AddProcess method. Let s pull it out so that we can see it a little more clearly (there s no need to make this change in your code; it is just for clarity):

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Predicate<Document> predicate = delegate(Document doc) { return !doc.Text.Contains(" "); }

Written like this, it looks recognizably like a function definition, except that we use the delegate keyword to let the compiler know we are providing a delegate. There s no need to specify the return type that is inferred from the context. (In this case, the delegate type is Predicate<T>, so the compiler knows the return type is bool.) Any parameters in our parameter list are accessible only inside the body of the anonymous method itself. Why do we call it an anonymous method Because it doesn t have a name that can be referenced elsewhere! The variable that references the delegate to the anonymous method has a name, but not the anonymous delegate type, or the anonymous method itself. If you compile and run the code you ll see the new output:

The production team is happy; but is the job done Not quite; although this inline syntax for an anonymous method is a lot more compact than a static class/function declaration, we can get more compact and expressive still, using lambda expression syntax, which was added in C# 3.0 (anonymous methods having been around since C# 2.0).

4. In theory, if Mallory knew exactly when in the conversation Alice was going to query Bob for the hash, and could impersonate Bob s voice, she might be able to still operate undetected as a man-in-themiddle. However, Mallory s job is extremely difficult, and Zimmermann argues that even with the resources of the NSA, Mallory s probability of success is too low to be pragmatic.

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