Password protection

I have an application that is called by another application when certain
criteria is met. The application starts a telnet session passing username
and password to a Cisco 1711 router. There is no user intervention. I need
to make the password so that it cannot be read in the code or be visible in
the app.config file. I saw a demo a couple of years back where a console
application was started you entered the password and it gave an encrypted
version back. You entered this in the config file and made a call to the
namespace and it would decrypt the password for transmission. Does anyone
know what I am referring to, or can point me at some reading I can do that
will solve my problem. This is a windows form app. I am coding in vb.net
2003 with the 1.1 framework. to be deployed on windows 2000 professional or
windows 2000 server


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