A method and system for authenticating access of secure information by a user device. An authentication request for accessing the secure information is received, the authentication request including a user identifier of a user at the user device. A position of a secret quadrilateral within a first pattern of colored quadrilaterals is determined and is identifiable by the user identifier; the secret quadrilateral includes an authenticating color. The first pattern of colored quadrilaterals including the secret quadrilateral is generated. A second pattern including colored nodes that include the authenticating color at positions within a transparent authenticating card assigned to the user. The first pattern and the second pattern are sent to the user. Location information from the user device is received. It is determined that the subset of nodes that include the authenticating color, which allows access to the secure information by the user device.