How do I create a encryption and decryption application.

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VS2010

Hi, I want to create an application that when a button is pressed it changes text for example "Code Project" Get's changed to "Riwe}Cdqmdfl" you can then paste it into a textbox it then changes back.

Posted 8-Mar-15 16:00pm

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-03-08T16:33:00

This is not "encryption", this is who knows what. All encryption deals with arrays of bytes and nothing else. The question makes no sense unless you explain your scenario, what the application should do. Just the application like that just unlikely makes any sense. When you do the encryption you should envision the scenario: it should allow access to data for some people and protect from some other people. How are those people different?

You need to learn the ideas of cryptography first:
http://en.wikipedia.org/wiki/Cryptography[^],
http://en.wikipedia.org/wiki/Symmetric-key_algorithm[^],
http://en.wikipedia.org/wiki/Public-key_cryptography[^].

I mean it: understanding the ideas is the main part here. Only when you understand it, you can really understand what you need. And the easiest part is using the implementation. With .NET FCL, you have a good set of cryptography algorithms:
https://msdn.microsoft.com/en-us/library/system.security.cryptography.asymmetricalgorithm%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.security.cryptography.symmetricalgorithm%28v=vs.110%29.aspx[^],
…
https://msdn.microsoft.com/en-us/library/System.Security.Cryptography%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/gg145025%28v=vs.110%29.aspx[^].

—SA