Patent 8176159 was granted and assigned to Avaya on May, 2012 by the United States Patent and Trademark Office.
A method for authentication is disclosed. During use, the observed usage of the device is compared to an expected pattern of usage of the device. Deviation between the observed and expected usage indicates that the user might not be authorized to use the device. If the deviation exceeds a threshold, a credential is required from the user to authenticate itself as the authorized user.