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class Administrator : NamedPerson { public override string Name { get { StringBuilder name = new StringBuilder(); AppendWithSpace(name, Title); AppendWithSpace(name, Forename); AppendWithSpace(name, Surname); return name.ToString(); } } } // ...

Notice how we derived from NamedPerson and added the override modifier to our Name property so that it overrides the abstract method in our base.

That s fine so far. What about our FirefighterBase Let s try doing exactly the same thing:

abstract class FirefighterBase : NamedPerson { public abstract void ExtinguishFire(); public override string Name { get; set; } } // ...

If we compile that, we get an error:

In asymmetric schemes, generating public/private key pairs requires special algorithms (the mathematics of which are beyond the scope of this book) For instance, to generate an RSA key pair, large random prime numbers must be generated as one of the steps in key generation Also, while you can choose your own public key in identity-based encryption (IBE), the private key must be generated using a master key and a special key generation algorithm used by the private key generator (PKG) In IBE, the master key should be chosen at random If you have not guessed it yet, generating random numbers tends to be important in both symmetric and asymmetric algorithms, and while we do not cover the mathematics of asymmetric key generation here, we do touch upon how to securely generate random numbers for use with cryptographic algorithms.

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'FirefighterBase.Name.set': cannot override because 'NamedPerson.Name' does not have an overridable set accessor

sb.append("<p/>"); return sb.toString(); } } // ************** // END TWITTER BLOCK // **************

We run into difficulty because FirefighterBase has both a getter and a setter for the Name property, but our base allows only a getter.

To use a programming language, you must master the fundamentals. You need to understand the elements required to construct a working program, and learn how to use the development tools to build and run code. You also need to become familiar with the everyday features for representing information, performing calculations, and making decisions. This chapter will introduce these core features of the C# language.

We ll be working in Visual Studio, the Microsoft development environment. There are other ways to build C# programs, but Visual Studio is the most widely used and it s freely available, so we ll stick with that.

If you don t have Visual Studio, you can download the free Express edition from http://www.microsoft.com/express/.

Before discussing random number generation, we briefly touch upon some practical aspects of how to generate keys Keep in mind that if an adversary can guess or steal your keys, any perceived security that you think your application might have is in fact only perceived Hence, when you generate keys, if you subsequently store them on disk, for instance, you may want to ensure that they do not touch or get automatically replicated onto other disks that are connected to a network You may also want to consider generating keys on a computer that is not connected to any network If you place newly generated keys into a file, you may want to consider putting them in a temporary or scratch directory such as /tmp (in Unix-based systems).

In the first part of this chapter, we ll create a very simple program so that you can see the bare minimum of steps required to get up and running. We ll also examine all of the pieces Visual Studio creates for you so that you know exactly what the development environment is doing for you. And then we ll build some slightly more interesting examples to explore the C# language. To create a new C# program, select the File New Project menu option, or just use the Ctrl-Shift-N shortcut. This will open Visual Studio s New Project dialog, shown in Figure 2-1, where you can pick the kind of program you want to build. In the Installed Templates list on the lefthand side, ensure that the Visual C# item is expanded, and inside that, select the Windows item applications that run locally on Windows are the easiest to create. We ll get into other kinds of programs such as web applications later in the book.

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