Implementations varied: some used simple linear arithmetic on numeric challenges; others employed cryptographic functions and required secret keys provisioned to dealers or authorized service centers. Where internet connectivity was available, servers sometimes performed the calculation, returning a TAN after verifying credentials.
Software that runs on a Windows PC to generate the codes based on the VIN. The Evolution of Smart Coding smart car tan code calculator 2011
As of 2011, these calculators were frequently bundled with "Super MB Star" or "MB Star C4" diagnostic packages. Integration: Many professional diagnostic systems, such as the MB Star Xentry System servers sometimes performed the calculation