US 4,303,852 A · Access security control

Abstract

This invention describes a system for access control, wherein a control card is presented to a control means. If the control card is authenticated, then access is gained. If it is not authenticated, access is not gained, the control card is retained, and an alarm may be sounded. The control card contains at least two means; (1) machine readable indicia identifying the card, and (2) a random pattern of micro spots, which pattern is derived (by direct copying-such as by focussed laser beam) from one of a plurality of different patterns, retained in a bank of such micro patterns, each such micro pattern identified by, and selectable in accordance with, different unique indicia, identical with the machine readable indicia on said cards. In use the control card is introduced into the control means and the indicia are read. Master micro pattern corresponding to the indicia is selected from the bank. The card micro pattern and master micro pattern are compared. If the comparison okay, the card is authenticated.

Claims10

Dependent claims

A system for access control, for selectively granting access on presentation and authentication of a control token, said system comprising:

A. a bank comprising
(1) storage means for storing a plurality of unique authenticating master coded bit patterns, each in different address locations;
(2) a plurality of address locations in said storage means, each address being an index of the bit pattern stored therein;
B. a plurality of control tokens, each control token comprising
(1) an unique object;
(2) means on said object for storing in machine readable form an unique index;
(3) means on said object for storing in machine readable and machine writeable form an unique coded bit pattern;
(4) each of said control tokens having one of said unique indicia and the corresponding unique authenticating coded bit patterns stored in said bank;
C. reading means to which a control token can be presented, said reading means including first means to read said indicium, and second means to read said coded bit pattern on said token;
D. means responsive to said first means to select from said bank said coded bit pattern corresponding to said indicium;
and
E. means to compare the unique bit pattern read from said token with the stored bit pattern in said bank corresponding to the read indicium.

9 more elements

Dependencies are inferred from the claim text.

Access security control

Life of this patent

Access security control

Life of this patent

Abstract

Claims10