Patent · US Expired

System for cryptographing and identification

US4962530A · kind A · utility

38Cited by
32References
11Claims
0Family size

Assignee

Inventor

Key dates

Filing dateSep 10, 1987
Grant dateOct 9, 1990
Priority date—
Expiry dateSep 10, 2007

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG07F7/1041
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

According to the invention, the keyboard consists of a matrix of keys and variable visible indicia. Each of the variable visible indicia is associated with a key. Upon each keystroke on the keyboard, the system randomly changes the positions of all of the indicia on the matrix. Because the true value of any particular key is independent of the value displayed on the variable visible indicia, a casual observer can not learn the keystrokes being entered into the keyboard. If the code entered at the keyboard matches a stored value, the user is granted access.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.