Card identification system

摘要: An identification element in the form of an integrated circuit, for example cards and similar data carriers. The contains a confidential code which is known only by lawful owner card compared circuit with typed code. To prevent unauthorized use card, independent (1), isolated from rest provided to detect incorrect inputs then render inoperable certain period time. off-period can be set as function possible permutations such way that it practically impossible fraud find out correct within normal validity card. (2) also used maintain operability predetermined time when has been without any further inputs. Thus possibility typing his undisturbed other persons before actual