  Non-orthogonal multiple access (NOMA) with successive interference
cancellation receiver is considered as one of the most potent multiple access
techniques to be adopted in future wireless communication networks. Data
security in the NOMA transmission scheme is on much attention drawing issue.
Blockchain is a distributed peer-to-peer network enables a way of protecting
information from unauthorized access, tempering etc. By utilizing encryption
techniques of blockchain, a secured data communication scheme using blockchain
in NOMA is proposed in this paper. A two-phase encryption technique with key
generation using different parameter is proposed. In the first-phase data is
encrypted by imposing users' public key and in the second phase, a private key
of the base station (BS) is engaged for encryption. Finally, the superiority of
the proposed scheme over existing scheme is proven through a comparative study
based on the different features.
