Pro ASP.Net 4 in C# 2010

CHAPTER 25 ■ CRYPTOGRAPHY

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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 of the CryptoStream class,

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.

Encrypting Sensitive Data

Now that you’ve ...