Algorithm for unique CD-KEY generation with validation

Question

I am trying to create a unique CD-KEY to put in our product\'s box, just like a normal CD-KEY found in standard software boxes that users use to register the product.

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Answer 1

Create the strings 000001, 000002, etc. or whatever and encrypt them with a public key, and that's your "CD-KEY" that the user enters. Decrypt the CD-KEY with the private key and validate that when decrypted you get a valid string with a valid provider name.