METHODS FOR ENHANCED LEVEL IN SECURITY IN ACCESS CONTROL PERFORMED BY AN AUTHENTICATION SERVER, AN ACCESS CONTROL DEVICE AND A KEY RESPECTIVELY, USING CHALLENGE AND RESPONSE AND OPTIONALLY INVOLVING MULTIPLE DEVICES

Abstract

A method (800) for access control. The method includes receiving (s802), at an authorization server (106), an indication that the user (101) has used or intends to use a key (102) in an attempt to gain access to a property (112), wherein access to the property is controlled by an access controller (104). The method also includes, after receiving the indication, the authorization server transmitting (s804) a first challenge to a first device associated with the user. The method also includes the authorization server receiving (s806) from the first device a response to the first challenge. The method also includes using the response to the first challenge, the authorization server determining (s808) whether the user is authorized to access to the property. The method further includes the authorization server sending (s810) a message indicating whether or not the user is authorized to access the property.

CPC Classifications