摘要：Signcryption is an effective cryptographic primitive, which simultaneously fulfils both the functions of encryption and signature with much lower cost than traditional schemes; it is an ideal method to provide confidentiality and unforgeability and ensure secure data storage and transmission in the IOT (Internet of things). In the paper, we propose a publicly verifiable short signcryption scheme S-ECSC for the Internet of things based on elliptic curves cryptosystem; and prove the provable security of S- ECSC under the Random Oracle model, including confidentiality in IND-CCA2 model, unforgeability in UF-CMA model and non-repudiation security. As per the efficiency analysis, S-ECSC achieves an average 80% reduction in computation cost compared with typical discrete logarithm, RSA based signcryption schemes, and has the lowest communication cost in Elgamal type signcryptions. With its superiority in efficiency and security, S-ECSC proves to be more suitable for resource-restricted environment in IOT and better satisfies the requirement of secure protocols in IOT, such as key management, secure routing, etc. At last, we take key generating and distributing protocol of distributed key management in IOT as an application example, and analyse the method and importance to apply S- ECSC into secure protocols in IOT.
关键词：internet of things; signcryption; provable security; distributed key management; system efficiency
