Blockchain based Cloud storage framework with Self- Sovereign-Identity and Access control

The cloud acts as a platform to store more number of data and it is known for its low cost computing and data storing efficiency.In recent time, more number of organizations and individuals utilize cloud storage services to back up the essential information.But, the stored data undergoes different kind of threats related to security issues due to internal and external attacks.Whenever, the data user request access to encrypt the data file, a key to access the file is distributed by the third party.But, when the third party becomes untrusted, the entire security system will be at risk.To overcome this issues, this research proposed a cloud storage framework along with the access control and block chain technique.The proposed research undergoes five stages such as initialization, encryption of data, generating the keys, authentication and authorization and data decryption.Among these stages, the authentication and authorization is performed using the proposed Self-Sovereign-Identity based Access Control (SSIBAC) which verifies the user's authenticity and permits him to access the data.The experimental results show that the proposed method achieved minimum delay of 1.59 s whereas the existing methods such as Block chain based Decentralized Architecture (BDCA) and Block chain-based Multi-authority Access Control (BMAC) achieved delay period of 2.10 s and 1.59 s respectively.