A Reliable Data Sharing Ownership Using Blowfish Algorithm in Cloud

Cloud storage platforms promise a convenient way for users to share files and engage in collaborations, yet they require all files to have a single owner who unilaterally makes access control decisions. Existing clouds are, thus, agnostic to the notion of shared ownership. This can be significant limitation in much collaboration because, for example, one owner can delete files and revoke access without consulting the other collaborators. In this project, a Blowfish algorithm is proposed which is a symmetric encryption algorithm, meaning that it uses the same secret key to both encrypt and decrypt messages. Proposed Blowfish is also a block cipher, meaning that it divides a message up into fixed length blocks during encryption and decryption. Here, first formally define a notion of shared ownership within a file access control model. Then propose two possible instantiations of our proposed shared ownership model. Unlike Commune, Comrade requires that the cloud is able to translate access control decisions that reach consensus in the block chain into storage access control rules, thus requiring minor modifications to existing clouds.