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System for cryptographing and identification

  • US 4,962,530 A
  • Filed: 09/10/1987
  • Issued: 10/09/1990
  • Est. Priority Date: 09/10/1987
  • Status: Expired due to Fees
First Claim
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1. A security apparatus for identification of a preselected code of characters by a predetermined cryptogram of symbols comprising in combinationa matrix consisting of an arrangement of a plurality of locations having selectively operable manual switches and variable visible indicia associated with said switches, said indicia operative to display letters and numerals at said locations,said switches being sequentially actuatable with a sequence of values representing a preselected code of symbols consisting of alphanumeric characters and matrix coefficients,a matrix coefficient consisting of a value represented by a visible indicia at a selected location at a selected sequence in said preselected code,a first memory containing a configuration of alphanumeric characters and matrix coefficients for display on said variable visible indicia,a predetermined program of a preselected code of symbols consisting of alphanumeric characters in binary coded decimals and matrix coefficient in said first memory having potential levels at addresses,means for providing pulses to said addresses in said first memory upon the operation of a switchmeans for transmitting the potential levels of said binary coded decimals from said first memory to said plurality of latches,means for storing said binary coded decimals in said latches whereby each transmitted binary coded decimal is stored in a latch,means upon operation of said switch for generating a pulse to a delay timing circuit,means for transmitting a delayed signal from said delay timing circuit to produce a timed sequence of signals selected to be transmitted to said selected latches subsequent to the storage of the binary coded decimals in said latches,transmitting the stored binary decimals in each of said latches to a decoding circuit and to a sending circuit,means associated with said first memory for displaying on said variable visible indicia upon actuation of said switches of a plurality of said symbols including at least one alphanumeric character and at least one matrix coefficient in said actuated code of symbols,means electrically connecting one of said manual switches to said sending circuit for providing a signal to said sending circuit upon operation of said manual switch,means for depositing the binary coded decimal from said sending circuit on an electrical connection to a microprocessor upon transmission of said signal from said manual switch,said microprocessor having a second memory accessed by the microprocessor, said microprocessor being operative for executing a program stored in said second memory,means for storing in said second memory at least one access code of a preselected code of symbols consisting of at least one alphanumeric character and at least one matrix coefficient,operative to sequentially enter to said microprocessor pulses defining said actuated code of symbols,said microprocessor having means for comparing the binary coded decimal produced by the operation of the sending circuit with the stored access code,and means providing a signal when the transmitted binary coded decimal is not equal the stored access code.

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