The units are decremented until the card is empty. The GAM275 holds unalterable data that can be used to identify each card, and uses a single diversified secret key and a hardwired algorithm to be authenticated The GAM275 is mainly used for prepaid telephone card applications, and offers major improvements over the GPM103, including active authentication with Security Application Module, pull-out management capabilities, and user data areas. The GAM275 is widely supported by terminal manufacturers.
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