Abstract: We proposed a signcryption based secure communication scheme and anonymous communication scheme for the Internet of things and analyzed the provable security of signcryption,including confidentiality,unforgeability and non-repudiation in Random Oracle model.As to efficiency analysis,the scheme achieves remarkable reduction in computational and communication cost compared with other secure protocols based on typical signature and encryption/decryption algorithms.With its superiority in computing and communication cost,it proves to be more suitable for resource-restricted environment in Internet of things and better satisfies the requirement of secure protocols in Internet of things,such as key management,secure routing,etc.