What's a good approach for developing a simple serial number generator/verifier?

Question

I\'m working on an app I\'d like to sell some day -- sooner rather than later! I\'d like to develop a reasonably simple serial number scheme to protect it.

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Answer 1

There is a Blog Post on sigpipe.macromates.com explaining how you use private/public key crypto for checking a serial number. It can verify that the user and Serialnumber match. (Signing/Verify). I would probably add some salt, just to be sure.

As this post is from 2004, you should consider the recommended keylength at keylength.com.