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A new authentication and key distribution scheme based on physical unclonable functions (PUFs) is proposed for two-tiered Internet of Things (IoTs). It provides two-way authentication and efficient key distribution at different tiers. The PUF is difficult to be cloned and predicted, which enhances the security and network performance of IoT nodes. Keys are not stored in nodes but instantly generated by the PUF, improving the resilience against node capture. The analysis shows that the proposal guarantees the authentication, security, and efficiency.
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