Abhishek Goenka gives a short introduction to the .NET Framework's SecureString class which stores strings in memory in an encrypted form so that the data contained in the strings in memory cannot easily be ready from outside the application.
The problem I have with the SecureString class is that it uses a proprietary encryption algorithm (MS DPAPI). I personally wouldn't trust it, it's a shame that they didn't decide to support AES instead.
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