Abstract
Abstract: Nowadays, a considerable amount of data is stored in the cloud, which must be kept safe against unauthorised access. Various algorithms are employed to ensure data privacy and security. Every system's goal is to achieve confidentiality, integrity, and availability (CIA). The existing centralised cloud storage, on the other hand, does not have these CIA qualities. Decentralized cloud storage is used in conjunction with hash algorithm used to improve data security and storage approaches. It efficiently aids in the protection of data against manipulation or the deletion of a portion of data. A data connects the blocks that hold data in a block chain. Each block contains a hash value that is stored in the following block. As a result, the possibilities of data loss are reduced. Keywords: Decentralized Cloud Storage, SHA-512, Advance Encryption Standard, Encrypt, Decryp,CIA
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