## 4 Authentication in UAV Networks
### 6G Enabled Light Weight Authentication Protocols
Moreover, privacy needs of DM are discussed. Lastly, research issues and possible solutions are presented to meet prospects for 6G-based DM in the blockchain model [112]. In this research, a communication model is suggested that comprises of Internet of Drones (IoD) and Internet of Healthcare (IoH) in conjunction with future wireless networks including 5G and 6G. Information is combined through access networks and is processed through a set of UAVs at the edge layer. In this study [113], a software defined network is perceived, in order to transport data in between edge and cloud layers. Moreover, to achieve accelerated process to accomplish the authentication role and to ensure privacy protection of moving vehicles, a P4C protocol (Privacy-Preserving Parallel Pedersen Commitment) was devised. This research further suggests the DPBFT (Diffused Practical Byzantine Fault Tolerance) model to achieve consensus that can significantly cut down latency involved in the consensus process and can achieve even better operational efficiency. The suggested cyber-chain model and related methods were assessed by qualitative evaluation and replication. The assessment outcome concluded that the suggested model brings considerable improvement in performance related to the authentication process. The key factors with improved performance include storage cost, latency in authentication, different overheads in communication and privacy [114]. In this paper [115], the suggested scheme meets all security-related concerns and addresses pertinent issues of privacy as well. The proposed model is capable of accomplishing an authentication sequence, however, with a slight increment in computation cost. The security feature of this suggested model was evaluated by informal and formal means in this paper, which concluded significant improvement in results. This paper [116], carried out a comprehensive exercise related to the incorporation of wireless communication models with blockchain, keeping several integration and performance aspects in consideration. Moreover, a unified structure named Blockchain radio access network (B-RAN) is suggested in this study for 6G networks employing a blockchain scheme as a reliable, secure and efficient model. During the recent work on blockchain in combination with IoT, multiple challenges have surfaced. One of vital challenges is concern of low throughput while employing blockchain with IoTs. Few assessments regarding transaction efficiency of blockchain versions have been carried out and it has been found that Ethereum blockchain is able to perform 12-15 transactions/s. This transaction processing speed of the Ethereum blockchain does not meet demands of future IoT networks, as the same requires a higher value of throughput in future scenarios. Hence, blockchains have limitation in capability for supporting and operating IoT networks based on 5G. The pertinent limitation regarding blockchain throughput is their network. In point-to-point networks, miners and verifiers do not have the liberty to mine and verify new blocks in a fast pace due to a relatively slow propagation pace of blocks and transactions in such networks. In said context, network scalability is foreseen as a prominent factor in IoT networks employing blockchain technology. In this article, the Raft consensus algorithm is discussed and it has determined that solution of network scalability can be materialized by employing blockchain distributed topology and consequently achieving the increased blockchain throughput. Privacy is one of the major issues in the list of challenges related to future IoT networks. One of the limitations in distributed blockchain is that ledgers are public and availability of perceptive information to everyone is private. In this scenario, in order to carry out third party editing, it is only possible once original content is revealed. In this paper [117], in order to address privacy-related concerns, zkLedger is utilized that relies on zero knowledge-based cryptography.