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How do I convert from int to Long in Java?

I keep finding both on here and Google people having troubles going from long to int and not the other way around. Yet I’m sure I’m not the only one that has run into this scenario before going from …

How to encrypt String in Java

What I need is to encrypt string which will show up in 2D barcode(PDF-417) so when someone get an idea to scan it will get nothing readable. Other requirements: should not be complicated it should not consist of RSA, PKI infrastructure, key pairs, etc. It must be simple enough to get rid of the people snooping around, and easy to