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How to store a downloaded 3DES key (from server) safely in my client application which is designed in c++/mfc

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Last Modified: 2013-12-14
I am facing problem in storing the key in my client application.
i used to get on demand or in interval  teh downloaded key from teh server application.
i want to save it for further use. can any body help in this how i can store it safly so that it cannot be hacked or destroyed by any other means.
i am using MFC in my client development.

thanks
pramod
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