Patent ID: 8014523
Filing Date: 2011-09-06
Classification: H04L,H04W

Abstract:
1. A method for generating keys for cryptographic processing of communication between a transmitting communication unit and a receiving communication unit of a sensor network, wherein the transmitting communication unit and the receiving communication unit are adapted to obtain knowledge about a secret function, the method comprising: selecting a value from a plurality of values, calculating a key based on the secret function applied to the selected value, processing data with the calculated key, and transmitting the processed data in association with the selected value to the receiving communication unit, wherein the secret function is from a set of functions where the set of functions is almost k-wise independent, wherein the secret function is shared between the communication units and pre-configured independently and randomly to the communication units, and the generated key is only based on information of the transmitting communication unit and that one of the communicating units is a central point and the other is a sensor wherein the key is generated securely despite k being independent of the number of sensors in the sensor network.