Lightweight Digital Signatures For Secure Communication Between Smart Devices In Internet Of Things

Internet of Things(IoT)comprises of large number of smart devices that can exchange sensed data by availing online services.Smart devices can directly interact with the human beings for sensing the healthcare parameters and transmitting to a central repository.During the data exchange,it is mandatory to secure the messages between sender and receiver to handle the malicious human based attacks.For providing secure communication,a number of signature based schemes are explored in literature but smart devices need more lightweight operations by ensuring desired security strengths.The main problem of signature based approaches is the computational overhead due to large real numbers required for signature and verification processes.We propose a light weight Shortened Complex Digital Signature Algorithm(SCDSA)for providing secure communication between smart devices in human centered IoT.We have used less extensive operations to achieve signature and verification processes like human beings do signatures on legal documents and verify later as per witness.We have also presented a Multi-option Parameter Selection(MPS)to use a signature-verification pair of expressions at particular index by adopting the common practice of human beings for using different signatures as per document criticality level.It enhances the security strength to guard against traffic analysis attacks.We also present a Physical Unclonable Functions(PUF)based security scheme.PUF exploits the random factors of IC manufacturing process to generate a variety of mismatches.It helps to generate different unique challenge-response pairs to store in repository and then use for secure associations between the smart devices in IoT.Memory based and Analog electronic based PUFs are mostly used for providing dependable security where MOS transistors based PUF achieve a large variety of mismatches with smaller sizes as compared to others.In this work,we present a PUF based Authentication Scheme(PAS)along session keying in order to ensure the secure interaction among smart devices in IoT.We have also proposed the registration and authentication mechanism along with session keying based on challenge-response pair.Next,we present the secure command execution protocol among requesting devices,gateway and smart devices.Results demonstrate the supremacy of our schemes as compared to preliminaries.To secure sensitive information exchange,we have considered a secure group communication scenario where logical trees are maintained for each group.The main problem is unnecessary rekeying when a smart device frequently joining or leaving the network.It causes computation,communication and energy overheads.To overcome the excessive rekeying problem,we have presented a Logical Tree based Secure Mobility Management Scheme(LT-SMM)using mobile service computing in IoT.It includes the group deployment phase where smart devices securely setup a group by registering with group heads for future secure information exchange.We have presented group deployment,mobile node joining and mobile node migration protocols.Moreover,we have used chaotic map based one-way hash functions to ensure message integrity.Consequently,the improved security protocols and techniques for IoT data security and user authentication provide dependable solutions.