Security system

Details Security system Security system

G - Physics

06

F

354/133

G06F 15/20 (1990.01)

Patent

CA 1298664

ABSTRACT A security system for controlling access to property having a user operated keyboard to key in and reset a composite password code. An indicator visually displays at least one code symbol varying with time. A memory device stores a current composite password code including at least two code symbols so that upon entry of the keyed-in password code through the keyboard, one of the stored password code symbols is replaced directly by the time varying code symbol to form a regenerated, composite password code which is then compared with the keyed-in password code to grant aces to the property when coincidence occurs between the keyed-in and the regenerated password codes. In response to non- coincidence, an alerting signal is generated to indicate the incorrect password condition.

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