By combining the Physical Unclonable Function (PUF) with the certificateless public key cryptosystem on the elliptic curve

a secure communication scheme for IoT is proposed.The secure transmission of messages is realized on the condition of node devices not storing any secret parameters.The proposed scheme eliminates the need for bilinear pairing whose computing complexity is high and provides a message authentication mechanism.Security analysis demonstrates that the scheme can not only resist the traditional attacks such as eavesdropping

tampering and replay

but also protect the node device from replication attacks.Compared with related schemes

the proposed scheme obviously decreases the resource overhead of devices.