Secured data transmission and data sharing have always been a challenge on the Internet of things-based networks. Blockchain-enabled peer to peer (P2P) networks are suitable infrastructure for the Internet of Things (IoT) and Beyond 5G (B5G) applications. The advantage is that the distributed nature of architecture and security services provided by this network extends its use in all sort of financial transactions. There are many issues related to IoT based networks; Heterogeneous IoT devices, security, energy issues. This paper implements data security by employing private blockchain in SDN and public blockchain for peer to peer communication and a secured authentication method to validate the blocks in the network. To increase confidentiality and non-repudiation, it implements an additional component; here, the sender signs the particular operation while transferring the data from one user to another user. It is published with a public key and Public-key value-based signature generated with the private key of the transaction. Nodes authenticate this operation based on Public key value-based signature thus generated. The cryptography with hashing process provides better immutability. The results show enhanced security during data transmission and improved throughput, response time, reduction in end-to-end delay and overhead when compared to the existing methods. This work uses Pyethereum tester tool under the Ethereum platform.

在基于物联网的网络上，安全的数据传输和数据共享一直是一个挑战。支持区块链的点对点（P2P）网络是物联网（IoT）和超越5G（B5G）应用程序的合适基础架构。优点是此网络提供的体系结构和安全服务的分布式性质扩展了其在各种金融交易中的使用。与基于物联网的网络有关的问题很多。异构物联网设备，安全性，能源问题。本文通过在SDN中使用私有区块链和在公共区块链中进行点对点通信以及一种安全的身份验证方法来验证网络中的块来实现数据安全。为了提高机密性和不可否认性，它还增加了一个组件。这里，发送者在将数据从一个用户传输到另一用户时签署了特定的操作。它使用公钥和通过事务的私钥生成的基于公钥值的签名发布。节点根据由此生成的基于公钥值的签名来验证此操作。带有哈希处理的密码学提供了更好的不变性。结果表明，与现有方法相比，数据传输期间的安全性得到了提高，吞吐量，响应时间得到了改善，端到端延迟和开销减少了。这项工作使用以太坊平台下的Pyethereum测试器工具。节点根据由此生成的基于公钥值的签名来验证此操作。带有哈希处理的密码学提供了更好的不变性。结果表明，与现有方法相比，数据传输期间的安全性得到了提高，吞吐量，响应时间得到了改善，端到端延迟和开销减少了。这项工作使用以太坊平台下的Pyethereum测试器工具。节点根据由此生成的基于公钥值的签名来验证此操作。带有哈希处理的密码学提供了更好的不变性。结果表明，与现有方法相比，数据传输期间的安全性得到了提高，吞吐量，响应时间得到了改善，端到端延迟和开销减少了。这项工作使用以太坊平台下的Pyethereum测试器工具。