Abstract: A method for implement an energy-efficient user access control to wireless sensor networks is disclosed. A user creates a secret key and sending it to a sensor. The sensor builds a first MAC value by the secret key and sends it to the Key Distribution Center which builds a second MAC value and sending it to the sensor. The sensor decrypts the second MAC value to get a random number, and builds a third MAC value by the random number. The third MAC value is used by the user to authenticate the sensor.

Abstract: A method and system for implementing activity-oriented access control (AOAC) to hospital information is disclosed. An access request device sends user credentials attaching user attributes to an AOAC server, which in turn searches activity rules that are assigned to user attributes from an activity server and a current work situation of the user from an activity recognition server. The AOAC server transmits an access request list corresponding to the activity rules and the current work situation of the user to the access request device so that it can select a desired access request among the list.