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The largest difficulties in cloud computing applications nowadays are related to trust computing, which has become increasingly important in recent years. In cloud computing, the user is given secure and effective storage so they can share some of their data as well as provide others access to it via searches. Therefore, by offering the security approach that has been presented in this study, the secured blockchain is offered.In this research, we addressed an main issue of secure data sharing usingcloud Blockchain Based key cryptographic data sharing (CBKCrypDS) in cloud service for IoT environment. The data sharing, i.e., transaction that can be secured through peer-to-peer blockchain is using cryptographic techniques.The experimental result shows the encryption and decryption time, latency and throughput is compared with other blockchain based techniques.