Text Encryption and Decryption
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You have seen the thread started by Andre?
He has published a "simple crypt program":http://developer.qt.nokia.com/wiki/Simple_encryption .
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You may be also interested in "QCA":http://delta.affinix.com/qca/
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See this "post":http://qt-project.org/forums/viewthread/3868/#175068 , I answered on another thread, Botan is great for fast encyption/decryption