ENHANCING SECURITY OF DATA IN CLOUD STORAGE USING DECENTRALIZED BLOCK CHAIN

Abstract

Nowadays, large amount of data is stored on the cloud which is required to be protected from the
unauthorized users. To maintain the privacy and security of data various algorithms are used. The objective of
every system is to achieve confidentiality, integrity, availability (CIA). However, the existing centralized cloud
storage lacks to provide these CIA properties. So, to enhance the security of data and storing techniques,
decentralized cloud storage is used along with blockchain technology. It effectively helps to protect data from
tampering or deleting a part of data. The data stored in blockchain is linked to each other by a chain of blocks.
Each block has its hash value, which is stored in next block. For this purpose, SHA-512 Hashing algorithm is
used. Hashing algorithm is used in many aspects, where the security of data is required such as message,
password verification, digital certificates and in blockchain. By the combination of these methods and
algorithms, data becomes more secure and reliable. However, with the help of various algorithms, the security of
the data can be enhanced. Also, Advance Encryption Standard (AES) is used to encrypt and decrypt the data due
to the significant features of this algorithm.