Abstract
In the LEAP (Localized Encryption and Authentication Protocol), disclosure of the initial key will threaten the security of the entire network. B.Tian and his fellows improved the LEAP and diminished the threat. They reduced the number of exposed communication keys resulted from the disclosure of the initial key. In this paper, we show the deficiency of the improved protocol put forward by B.Tian et al and propose a new key management protocol for multiphase hierarchical WSN (NPMHW) . NPMHW designs a special method to establish the key ring by using random numbers and the HASH function. It also introduces a mechanism to detect whether the node is captured or not. Analysis indicates that, compared with B.Tian’s protocol, NPMHW localized the threat and greatly reduced the number of the exposed communication keys caused by the disclosure of the initial key. Therefore, the protocol raised in this paper is much safer.
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