Password-protected access to e.g. site or computer network, employs computer disguising access code by display of two character sets

摘要

The user has a real access code, e.g. a pin number. The access code is stored by the central computer unit (11). It displays two sets of characters on the screen, each character of the first set being in one-to-one correspondence with a character of the second set. The user employs this association between the sets to encode the pin number, producing a temporary, substitution-encoded pin number. It is this temporary pin number which is entered by the user and recognized by the computer, to validate access. The computer then changes the association. An independent claim is included for a password-protected access control unit.