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The big problem is that asymmetric algorithms are much slower (depending on the size of the data you want to encrypt) than symmetric algorithms. This will affect the performance of your application if you need to exchange data through lots of requests. Therefore, technologies such as SSL use asymmetric algorithms at the beginning when establishing a connection session. Through the first communication steps, traffic between the client and the server is secured through asymmetric encryption (the client encrypts with a public key, and the server decrypts with a private key). With these steps the client and the server can exchange a symmetric key securely. This symmetric key then secures traffic for any subsequent communication through symmetric encryption. This combines the advantages of symmetric and asymmetric encryption. Of course, you have to find a way to securely store the private key so that unauthorized people don t have a chance to access it.

The last URL pattern, editing an individual contact, closely follows the pattern used to add a new contact. The only difference between the two is the regular expression used to match the URL. The previous pattern didn t capture any variables from the URL, but this one will need to capture a username in order to populate the form s fields. The expression used to capture the username will use the same format as the one from the detail view, but will use the name of instead of .

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If you don t store the private key on an external device such as a smart card, you create a chance of someone gaining unauthorized access (and even the smart card is not completely secure, because you can lose it), especially if actors are administrators of machines. But you should always make your solution as secure as possible and raise the bar for attackers. Therefore, any additional security mechanism (gatekeeper) will make life for a potential attacker harder.

The abstract encryption classes actually serve two purposes. First, they define the basic members that encryption implementations need to support. Second, they provide some functionality, through the static Create() method, that you can use directly without creating a class instance. This method allows you to create one of the concrete implementation classes without needing to know how it is implemented. For example, consider the following line of code: DES crypt = DES.Create(); The static Create() method returns an instance of the default DES implementation class. In this case, the class is DESCryptoServiceProvider. The advantage of this technique is that you can code generically, without creating a dependency on a specific implementation. Best of all, if Microsoft updates the framework and the default DES implementation class changes, your code will pick up the change seamlessly. This is particularly useful if you are using a CryptoAPI class, which could be replaced with a managed class equivalent in the future. In fact, you can work at even higher level if you want by using the static Create() method in one of the cryptographic task classes. For example, consider this code: SymmetricAlgorithm crypt = SymmetricAlgorithm.Create(); This creates an instance of whatever cryptography class is defined as the default symmetric algorithm. In this case, it isn t DES but is Rijndael. The object returned is an instance of the RijndaelManaged implementation class.

It is good practice to code generically using the abstract algorithm classes. This allows you to know which Tip type of algorithm you are using (and any limitations it may have) without worrying about the underlying implementation.

The only things missing from this application now are the four templates mentioned in the URL patterns. Since this book is targeted at development, rather than design, those are left as an exercise for the reader.

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