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If Bob is given such a message with an accompanying signature, he may be able to go to the bank and present both the message and the signature to have $10 put into his own bank account Digital signatures have many applications In Section 155, we show how digitally signed certificates are used in the SSL protocol Digital signatures can also be used to sign binary code this allows a user to authenticate the source of the code as part of a decision that she can make as to whether the code is safe to run In addition, digital signatures can be used to authenticate the source of an e-mail We first describe how digital signature schemes based on asymmetric cryptography work in general, and then we comment on some odds and ends.

public void Unsubscribe(DocumentProcessor processor) { processor.Processing -= processor_Processing; processor.Processed -= processor_Processed; } void processor_Processing(object sender, ProcessCancelEventArgs e) { Console.WriteLine("Tool1 has seen processing, and not canceled."); } void processor_Processed(object sender, EventArgs e) { Console.WriteLine("Tool1 has seen that processing is complete."); }

}

class ProductionDeptTool2 { public void Subscribe(DocumentProcessor processor) { processor.Processing += (sender, e) => { Console.WriteLine("Tool2 has seen processing and canceled it"); if(e.Document.Text.Contains("document")) { e.Cancel = true; } }; processor.Processed += (sender, e) => Console.WriteLine("Tool2 has seen that processing is complete."); } }

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Notice how we don t have to update the event data parameter we can take advantage of polymorphism and just refer to it through its base type, unless we want to take advantage of its new features. In the lambda expression syntax, of course, the new type parameter is inferred and we don t have to change anything; we can just update the handler in ProductionDeptTool2 to cancel if it sees the text "document". If we compile and run, we now see the following output:

The process will not succeed. (Document 1) Tool1 has seen that processing is complete. Tool2 has seen that processing is complete. Tool1 has seen processing, and not canceled. Tool2 has seen processing, and not canceled. Document traduit. (Document 2) Spellchecked document. (Document 2) Repaginated document.

We can implement digital signatures using asymmetric algorithms such as RSA, ECC, and IBE, as discussed in 13 In the following subsections, we describe how to use asymmetric encryption operations F and F 1 to implement a digital signature scheme, and we do so in two steps First, we introduce two basic functions, S() and V(), which help us do some primitive signature and verification operations, and then show how S() and V() can be used to implement the Sign() and Verify() operations Since asymmetric operations are usually very computationally expensive, instead of applying them over the entire message M (which could be megabytes or even gigabytes), we apply asymmetric encryption and decryption operations over the secure hash of the message, h(M) We can sign a message by decrypting its hash with a secret key:.

(Document 2) Highlighting 'millennium' (Document 2) Tool1 has seen that processing is complete. Tool2 has seen that processing is complete. Tool1 has seen processing, and not canceled. Tool2 has seen processing and canceled. Process canceled. (Document 3) Executed 6 processes.

So we have our cancellation behavior, but we have to be very careful. Notice that Tool1 happened to see the event first, and it happily executed its handler, before Tool2 got in and canceled the whole thing. When you write handlers for cancelable events, you must ensure that it doesn t matter if some or all of those handlers never get called and that they behave correctly if the action they expect never actually occurs. Cancelable events need very careful documentation to indicate how they relate to the actions around them, and the exact semantics of cancellation. It is therefore (in general) a bad idea to do what we have just done, and convert a noncancelable event into a cancelable one, if your code has already shipped; you stand a very good chance of breaking any clients that just recompile successfully against the new version.

The first thing you will see is the Operations list box in the upper-left corner of the block. There are two operations getItems and getFeed. A short description of the operation is below the list box. Select getItems as the operation that we will execute. The description updates to read, Retrieves items from the specified RSS feed. The operation getFeed retrieves general information about the feed like the author and URL. This doesn t serve our needs in this example. Below Operations is the Inputs section; inputs are required for the operation to work. Required fields are indicated with an asterisk and usually have default values. In this case, what is required is the URL of the feed you want to retrieve. The default value for the RSS block is the MSDN blog feed (http://blogs.msdn.com/MainFeed.aspx). Type http:// blogs.msdn.com/eric_griffin/rss.xml into the value field. You will notice that the source field is grayed out and disabled. The source field is disabled when no block is connecting into the block (i.e., from the left-side connector).

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