When software comes with a license code, e.g. HXD5S-LB99C-HII54 how does the program know the code is valid without internet validation? For example, some older Microsoft software like Office 2003 could be installed without internet access and you would type in the code and the computer would validate the code. I’ve always been curious about this and the mechanism of how validation occurs.
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I am sure someone will chime in with a better example..
The code to validate the license is more than likely part of the same code that generates the license. So the code takes 0 or more inputs and creates a “hash” of that output – this then becomes the license code.
The software can take that “hash” and the same 0 or more inputs to validate that hash was correct. That way the software does not need an internet connection.
Also, because the code to validate the hash is embedded in the software, incredible coders can reverse engineer that code and use it to create a keygen to create keys for the same software.
I have tried to keep this simple and I hope it makes sense?
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