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Because bigChiefHarry is an object of type FireChief, and a FireChief is a Fire fighter, we can assign him to be the driver of a truck and tell him to drive it somewhere. But because he is a FireChief, we can also ask him to tell Joe to put out the fire when he gets there. Wherever we talk about a FireChief, we can treat the object as a Firefighter. This use of one type as though it were one of its bases is an example of polymorphism. Equally, we could phrase that the other way around: we can successfully substitute an instance of a more-derived class where we expect a base class. This is known as the Liskov Substitution Principle (LSP) after computer scientist Barbara Liskov, who articulated the idea in a paper she delivered in 1987.

After briefly discussing how symmetric ciphers worked in 12, we provided some examples of them, such as DES and AES Now that you have learned how asymmetric ciphers work in general, we give two examples of them; namely, RSA and ECC RSA was the first asymmetric encryption algorithm ever published Shortly after Diffie and Hellman published a paper about the idea of an asymmetric cipher, Rivest, Shamir, and Adelman (the R, S, and A, in RSA) came up with a concrete algorithm that was able to serve as an asymmetric encryption scheme RSA is the most widely known and used asymmetric cipher It is used in a variety of different protocols in the world of computer security, including SSL, CDPD,1 and PGP 2 RSA has been used in many different applications to date, and is likely to be used in many different applications in the future.

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It is quite possible to derive one class from another in a way that means we can t treat the derived class as its base type. The derived class could change the meaning or behavior of a function with the same signature as its base, or throw errors in situations where the base promised that everything would be fine say, the base accepted parameters in the range 1 10, where the derived class accepts parameters in the range 2 5. This violates the LSP, which is a very poor design practice, but it is very easy to slip into, especially if the classes evolve independently over time.

What happens if our client doesn t know that Harry is a fire chief, though What if we refer to the object via a reference typed to Firefighter instead

After pressing the OK button, you will be returned to the VWD main window. To the upper left is a window with Solution Explorer tab that represents the web site you just created (see Figure 8-14). The Solution Explorer is a tree list that works like a virtual disk drive showing you all of the files and folders that the project uses. You should see all of the folders and many of the files that you saw in the root Tester folder in Figure 8-14. A couple of files are hidden, but we will go into that later.

FireChief bigChiefHarry = new FireChief { Name = "Harry" }; // Another reference to Harry, but as a firefighter Firefighter stillHarry = bigChiefHarry; Firefighter joe = new Firefighter { Name = "Joe" }; stillHarry.TellFirefighterToExtinguishFire(joe);

You know that stillHarry is referencing an object that is a FireChief, with that extra method on it. But the compiler produces a long, semicomprehensible error full of useful suggestions if you try to compile and execute this code:

The mathematical properties of the RSA algorithm are based on number theory The security of the algorithm depends on the difficulty of factoring large prime numbers If it is difficult to factor large prime factors, it will be hard to break the mathematical properties of the algorithm Common key sizes that are used with RSA are 1024, 2048, and 4096 bits Since RSA is fundamentally different than any other encryption algorithm, these key sizes do not have a direct relation to the key sizes of other algorithms, such as AES or Triple DES That is, a message encrypted with a 2048-bit RSA key may not be any more or less secure than a message encrypted with a 256-bit AES key.

'Firefighter' does not contain a definition for 'TellFirefighterToExtinguishFire' and no extension method 'TellFirefighterToExtinguishFire' accepting a first argument of type 'Firefighter' could be found (are you missing a using directive or an assembly reference )

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