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XNA provides an asynchronous alternative for almost all networking methods that require some time to complete. For example, the asynchronous counterpart of the NetworkSession.Find method is the NetworkSession.BeginFind method. At the beginning of an asynchronous operation, XNA will launch a second thread on which the operation is performed, allowing it to run in parallel with your main program. As an advantage, your main program will only initiate the asynchronous operation and continue immediately. This allows you to provide the user with any information you like while the asynchronous operation is running in the second thread. Once the asynchronous operation has completed, the result will be passed to a method that you have to specify. This allows you to process the results gathered by the asynchronous operation.
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So, you ll be tempted to put the keys in the application that resides outside of the database. That ll work to a degree; it ll solve the problem of what happens when someone steals my database because they won t have the keys. But you really haven t solved the problem; you still have to have a method to release the keys to the application itself. As connections are added by your application server, they would need access to this key to encrypt and decrypt information. How do they get it Do you store it in a file so it could be automatically retrieved If so, does that mean you are storing the key in an unprotected file in clear text (Yes, it does.) So, maybe you ll encrypt that file with the keys in it, which leads us back to the problem of how to get the key to decrypt the file with the other keys in it. So you end up writing a key server process that can be started by someone and a password (key) passed to it so it can decrypt the file and serve keys out to the applications as they request them, but then this server must implement non-repudiation (be sure of valid clients only), anti-data tampering, and the network encryption. In addition to that, you have to make sure the backup and recovery of this key store is managed in conjunction with the database. In order to properly restore a database, you ll need the keys that were in place at the time the database was backed up. If you don t have them, your data will be unavailable. So now there is coordination between the application server backup and the database backup. And, just to keep going on this thread, there is the problem of periodic re-keying of data. Many standards and legal regulations mandate the periodic changing of the keys to protect data. The thought is, the longer a key is used, the higher the probability the key has been compromised. So there must be some way to change the keys used to encrypt data over time. You ll have to not only write the processes that re-keys (decrypt your data with the old key and encrypt with the new key), but ensure you can maintain the history of keys in the event you need to restore a database at some point. To compound this problem, consider an environment where you have some data sharing going on. Suppose your transaction system must feed data into an Operational Data Store which, in turn, feeds a Data Warehouse. If you encrypt the data in one, you better encrypt it in the other, and so on. Key management has just gone up another level in complexity. In other words, you would be reinventing the entire framework Oracle provides and calls Transparent Data Encryption. I am not a fan of reinventing the wheel, and this is a really hard wheel to reinvent in a secure fashion, so I m not going to spend much time on this approach in the Implementing Manual Application Encryption section beyond introducing the packages available and demonstrating how to measure their performance impact.
4. Don Box with Chris Sells, Essential .NET Volume 1: The Common Language Runtime (Boston: Addison-Wesley, 2003), pp. 13 23.
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