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Broadcast authentication is a critical security service in Wireless Sensor Networks (WSNs), as it allows the mobile users of WSNs to broadcast messages to multiple sensor nodes in a secure way. Previous solutions on broadcast authentication are mostly symmetric-key-based solutions such as ?TESLA and multilevel ?TESLA. These schemes are usually efficient; however, they all suffer from severe energy-depletion attacks resulted from the nature of delayed message authentication. Being aware of the security vulnerability inherent to existing solutions, the authors present several efficient public-key-based schemes in this chapter to achieve immediate broadcast authentication with significantly improved security strength. The schemes are built upon the unique integration of several cryptographic techniques, including the Bloom filter, the partial message recovery signature scheme and the Merkle hash tree.
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