Design of the membership concept (off-chain) between IoT nodes

The development of Internet of Things sector promise to revolutionize our everyday life. The availability of high-speed connection, the affordability of low-power, low-cost sensor technologies, the growing popularity of cloud computing, and the growing usage of data processing and analytics are the main drivers of the Internet of Things market. Moreover, the expansion of smart city projects around the globe, a rise in connected devices and the emergence of 5G technology will facilitate IoT adoption internationally. The vast diffusion of connected devices in the IoT has created enormous demand for robust security. It must be a top priority to address these issues and guarantee security in IoT goods and services. The promotion of trust of these technologies is of primary importance. In this context were born protocols for Self-Sovereign Identity (SSI). The core concept of SSI is to move the control of digital identity from third-party identity providers directly to individuals. This is achieved through Verifiable Credentials (VCs) supporting anonymity and selective disclosure. One platform that can be used to implement these protocols is IOTA Tangle, on which was designed a layer two protocol called L2Sec. The problem which this work is willing to explore is how a member of a Self Sovereign Identity scheme is supposed to verify that another member, with who is in contact, is a node authorized to write its own Decentralized Identifier (DID) (since in an environment without any central authority anyone can create his own identity) on the Root of Trust (RoT) which can be a distribute ledger technology (DLT) or directly a blockchain. The aforementioned problem is modelled as a proof of membership in a dynamic group. Three different methods are proposed to begin the research that has the scope to solve the problem based on Merkle trees, BBS Group Signature (BBS from the authors Boneh, Boyen and Shacham) and Dynamic Accumulators.