• Shamsundar Sadashiv Bhimade
• A. M. Dyade

Group data sharing in block chain technology and cloud computing has become a hot topic in recent. With the popularity of cloud computing, how to achieve secure data sharing in cloud environments is an urgent problem to be solved. Although encryption techniques have been used to provide data confidentiality and data security in cloud computing, current technique cannot enforce privacy concerns over encrypted data associated with multiple data owners, which makes co-owners unable to appropriately control whether data distributor can actually distribute their data. Data Sharing in Cloud Computing, in which data owner can share private data with a group of users via the cloud in a secure way, and data distributor can distribute the data to a new group of users if the attributes satisfy the access policies in the encrypted data. Further present a multiparty access control mechanism over the distributed encrypted data, in which the data co-owners can append new access policies to the encrypted data due to their privacy preferences.

Block chain, Data sharing, cloud computing, Data auditing, encryption, Privacy conflict.

"Data Sharing with Fine-grained Access Control using Block chain Technology", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 2, page no.453-456, February-2020, Available :http://www.jetir.org/papers/JETIR2002270.pdf

"Data Sharing with Fine-grained Access Control using Block chain Technology", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 2, page no. pp453-456, February-2020, Available at : http://www.jetir.org/papers/JETIR2002270.pdf