In this case, a device should know its own serial number and be able to "add" (or append) some secret (usually called "salt") to the serial and then hash or encrypt it. Previously, I phrased that as "it is easy to turn a cow into a hamburger, but hard to turn a hamburger into a cow". You'll see a lot of suggestions for using hashing functions, those functions are easy to go one way, but hard to go backwards. You want it to be easy to check, and hard to "go backwards". This routine will produce strings like this when set to create a 10 digit string, which is reasonably random. So, generating one for each of your devices and storing them somewhere might be your only option because of the offline considerations. Private const string _chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789" //Added 1-9īuffer = _chars Here is a method borrowed from another SO answer, I've added digits as well private readonly Random _rng = new Random() Your best, unfortunately would be to generate a set of random codes, and validate them when user’s call in.
#Serial numbers keygen software#
So in your scenario someone will attach your device to some system, and the accompanying software that you intend to write this routine on will make a check against the serial number of the device v/s user input.īased on answer, given the offline nature of your request. In your case you want to do this offline. online where the producer has more control over their content and can explicitly authorize and authenticate a user. This has been a long battle that will never end, hence the move to deliver software as services, i.e. Just do a search engine query for “Crack for Xyz software”. The operation as you stated must be done onlineįirstly, there will be no way to say with absolute certainty that someone will not be able to decipher your key generation routine, no matter how much you attempt to obfuscate. Whatever key you generate must be able to be entered easily, so this eliminates some weird hash which may produce characters which will be cumbersome to type, although this can be overcome, it’s something you should consider.
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