Reuesting a suggestions for the best cryptography.

We have a product under development and one of the module is to use encryption/decryption. Can anyone suggest me which one is the best?
Thanks in advance!

For this purpose, I'd think pretty much ANYthing would be suitable. How about this - get the timestamp for the time you want the eval to expire, and XOR the bits into the MD5 hash of your application's name. Reverse on the client side.
Can your clients undo this? Yes. Of course, if you use "real" crypto and bury a key in your app, they're just going to spend the 15 minutes it will take to dig that key out and make their own timebombs. If you use something like RSA, with the public-key in the client and a license that was encrypted with the private key, they'll just modify your app to disable the license check entirely. They may do both, just because they can.
What you want is something that will be dead easy to implement and maintain for you, and mildly painful for your clients to undo. You hit diminishing returns almost immediately after that point.
Grant

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