A credit card verification system is disclosed for use with identification cards carrying a changeable recording medium. On presentation, cards are sensed to provide signals that are indicative of the credit status of the bearer and additionally, the system senses signals to indicate that the card is being used for the first time, providing such is the case. The initial-use situation is indicated by the system (as a caution) and the card is cleared of such representations for further use. As disclosed, the initial-use signals are developed from an individual signal on the card and a specific code of the data signals.
This invention relates to a method and system for verifying authenticity safe against forgery of an object releasing a function said object being of base material having random imperfections in or on the same, comprising measuring random imperfections in or on the base material of said object in a predetermined measuring track over the surface of said object of base material having random imperfections in or on the same by means of a detector for detecting said random imperfections, said random imperfections optionally being supplied to said base material, converting said measured random imperfections into pulses, supplying said pulses together with timing pulses to an AND gate, whereby only simultaneously arriving pulses are passed, supplying said passed pulses to a shift register shifting with said timing pulses to obtain a binary code, comparing said binary code with a previously stored binary code of the same object, whereby the function is released if said binary codes are identical; as well as a system for carrying out the method.
