Authentication and Key Establishment in Wireless Sensor Networks

摘要

A wireless sensor network (WSN) and a method for establishing a communication key between devices in a WSN. The WSN comprises a first device configured for sending a request message to a second device, the request identifying at least a third device for communication with which a communication key is intended, a first random number, and a first authentication code generated using a first secret key shared between the first and second devices; the second device configured for authenticating the first authentication code based on the first secret key, for generating the communication key based on the first secret key, the first random number, and a second random number using a hash function, for sending an approval message to the third device, the approval message comprising, in encrypted form based on a second secret key shared between the second and third device, the communication key and the first and second random numbers; the third device configured for decrypting the communication key and the first and second random numbers based on the second secret key and for sending a notice message to the first device, the notice message comprising the first and the second random numbers; and the first device configured for recalculating the communication key, based on the first secret key and said received first and second random numbers using said hash function.