Random key pre-distribution with transitory master key for wireless sensor networks

Many Wireless Sensor Networks (WSNs) employ security schemes based on the symmetric encryption, which requires the establishment and management of cryptographic keys. This paper presents a new key management scheme based on Random Key Pre-Distribution. The novelty of the proposed approach is the introduction of a keyed transformation with a Transitory Master Key, which is exploited by the nodes in order to increase the number of different keys employed in the network. The presence of a larger pool of keys provides more robustness and connectivity than previously proposed Random Key Distribution schemes. Furthermore, random pre-distribution allows recovering secure communication also when the master key has been compromised.