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.NET uses a stream-based architecture for encryption and decryption, which makes it easy to encrypt and decrypt different types of data from different types of sources. This architecture also makes it easy to perform multiple cryptographic operations in succession, on the fly, independent of the low-level details of the actual cryptography algorithm you re using (such as the block size). To understand how all this works, you need to consider the core types the ICryptoTransform interface and the CryptoStream class. The ICryptoTransform interface represents blockwise cryptographic transformation. This could be an encryption, decryption, hashing, Base64 encoding/ decoding, or formatting operation. To create an ICryptoTransform object for a given algorithm, you use the CreateEncryptor() and CreateDecryptor() methods (depending on whether you want to encrypt or decrypt data). Here s a code snippet that creates an ICryptoTransform for encrypting with the DES algorithm: DES crypt = DES.Create(); ICryptoTransform transform = crypt.CreateEncryptor(); Various cryptographic tasks execute in the same way, even though the actual cryptographic function performing the transformation may be different. Every cryptographic operation requires that data be subdivided into blocks of a fixed size before it can be processed. You can use an ICryptoTransform instance directly, but in most cases you ll take an easier approach and simply pass it to another class: the CryptoStream.

The CryptoStream wraps an ordinary stream and uses an ICryptoTransform to perform its work behind the scenes. The key advantage is that the CryptoStream uses buffered access, thereby allowing you to perform automatic encryption without worrying about the block size required by the algorithm. The other advantage of the CryptoStream is that, because it wraps an ordinary .NET stream-derived class, it can easily piggyback on another operation, such as file access (through a FileStream), memory access (through a MemoryStream), a low-level network call (through a NetworkStream), and so on. To create a CryptoStream, you need three pieces of information: the underlying stream, the mode, and the ICryptoTransform you want to use. For example, the following code snippet creates an ICryptoTransform using the DES algorithm implementation class and then uses it with an existing stream to create a CryptoStream: DES crypt = DES.Create(); ICryptoTransform transform = crypt.CreateEncryptor(); CryptoStream cs = new CryptoStream(fileStream, transform, CryptoStreamMode.Write); // (Now you can use cs to write encrypted information to the file.) Note that the CryptoStream can be in one of two modes: read mode or write mode, as defined by the CryptoStreamMode enumeration. In read mode, the transformation is performed as it is retrieved from the underlying stream (as shown in Figure 25-3).

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Figure 25-3. Reading and decrypting data In write mode, the transformation is performed before the data is written to the underlying stream (as shown in Figure 25-4).

Figure 25-4. Writing and encrypting data You cannot combine both modes to make a readable and writable CryptoStream (which would have no meaning anyway). Similarly, the Seek() method and the Position property, which are used to move to different positions in a stream, are not supported for the CryptoStream() and will throw a NotSupportedException if called. However, you can often use these members with the underlying stream.

The meat and potatoes of a real estate company is, of course, real estate. Individual buildings or pieces of land are typically called properties, but that term shouldn t be confused with Python s notion of properties, described in 2. This name clash is unfortunate, but not unexpected; it s quite common for entirely different groups of people to use the same terms with different meanings. When this situation arises in general, it s often best to use whatever term is most widely understood by your audience. When meeting with real estate agents, you should be able to use property to refer to a piece of real estate, without any confusion or explanation. When talking to programmers, property might refer to a model, an object or a built-in function. Python s decorator is useful for many situations, but the majority of this chapter will be focusing on other Python techniques. In light of this, the term property will refer to a real estate property unless otherwise specified.

Now that you ve taken an in-depth look at .NET cryptography, it s time to put it all together. In the following sections, you will create two utility classes that use symmetric and asymmetric algorithms. In the Encrypting Sensitive Data in a Database section, you will use one of these classes to encrypt sensitive information such as a credit card number stored in a database and to encrypt the query string. You need to perform the following steps to encrypt and decrypt information: 1. Choose and create an algorithm. 2. Generate and store the secret key. 3. Encrypt or decrypt information through a CryptoStream. 4. Close the source and target streams appropriately. After you have created and tested your encryption utility classes, you will prepare a database to store secret information and then write the code for encrypting and decrypting this secret information in the database.

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