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An external device allows the owner of a key to remove the key from the host system, and maintain physical possession of the device that carries the key. However, all of the options introduced are vulnerable to situations in which the host system the device is connected to has been compromised and is running malicious code. Such malicious code could, for instance, make the user believe that she is providing her key to authorize an intended transaction, but actually causes the key to be used to authorize a modified or entirely different transaction. An important advantage arises from devices where the cryptographic operation (e.g., digital signature) is actually executed on the device, and where the private key material never leaves the device (e.g., smart cards or HSMs). If the device is connected to a compromised host, the attacker s malicious code may be able to use the device to perform cryptographic operations with the user s key while it is connected. However, unlike in the case of a key disk, the malicious code cannot extract the key and continue using it after the device has been disconnected again.

class DocumentProcessor { private readonly List<Action<Document>> processes = new List<Action<Document>>(); public List<Action<Document>> Processes { get { return processes; } } public void Process(Document doc) { foreach (Action<Document> process in Processes) { process(doc); } }

}

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Compile and run, and you ll see that we still get our expected output. If you were watching the IntelliSense as you were typing in that code, you will have noticed that there are several Action<> types in the framework: Action<T>, Action<T1,T2>, Action<T1,T2,T3>, and so on. As you might expect, these allow you to define delegates to methods which return void, but which take two, three, or more parameters. .NET 4 provides Action<> delegate types going all the way up to 16 parameters. (Previous versions stopped at four.) OK, let s suppose that everything we ve built so far has been deployed to the integration test environment, and the production folks have come back with a new requirement. Sometimes they configure a processing sequence that fails against a particular document and it invariably seems to happen three hours into one of their more complex processes. They have some code which would let them do a quick check for some of their more compute-intensive processes and establish whether they are likely to fail. They want to know if we can implement this for them somehow. One way we might be able to do this is to provide a means of supplying an optional check function corresponding to each action function. We could then iterate all of the check functions first (they are supposed to be quick), and look at their return values. If any fail, we can give up (see Figure 5-3). We could implement that by rewriting our DocumentProcessor as shown in Example 5-13.

class DocumentProcessor { class ActionCheckPair { public Action<Document> Action { get; set; } public Check QuickCheck { get; set; } } private readonly List<ActionCheckPair> processes = new List<ActionCheckPair>(); public void AddProcess(Action<Document> action) { AddProcess(action, null); } public void AddProcess(Action<Document> action, Check quickCheck) { processes.Add( new ActionCheckPair { Action = action, QuickCheck = quickCheck }); } public void Process(Document doc) { // First time, do the quick check foreach( ActionCheckPair process in processes) { if (process.QuickCheck != null && !process.QuickCheck(doc))

Once keys have been generated and stored safely, they can be used to initiate a conversation (e.g., between Alice and Bob). In the case that Alice and Bob already have access to the same

{ }

Console.WriteLine("The process will not succeed."); return;

}

}

I use Technorati all the time to search blogs and dig into a particular topic. Technorati is more than a search engine; there are many other features that make it an invaluable tool for bloggers and researchers. After navigating your browser to Technorati s home page, type Silverlight into the search box at the top of the window to see a result similar to Figure 9-2. Not only are you given results from hundreds of blogs based on your search words, you are given a credibility rating for the blogs authors. The rating is based on the number of people who link back to the post as a source, so the more people who link to your post, the higher the rating goes cool. Technorati also provides an API for registered users to use for their own purposes. Before you can use the API, you need to become a registered user. From the Technorati page, click the Join link to start the registration process (see Figure 9-3).

}

key, they can directly use a symmetric encryption algorithm to start communicating. However, if they do not already share a symmetric key, they need to agree upon one. Alice and Bob also may not have access to an already secure communication channel, but might like to create one.

// Then perform the action foreach (ActionCheckPair process in processes) { process.Action(doc); }

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