Cyber Times International Journal of Technology & Management

Cloud computing is an emerging technology that can allow user’s large amount of data to store in cloud and it can be access from anywhere. There are two important aspects of cloud storage: Data integrity and Data compression. Maintaining data integrity is one of the major challenges in cloud computing because the user has no control over the security mechanisms that are used to protect the data. For assuring data integrity use of hash functions increases, which is also called as message digests or one-way encryption, have no key [1].

A cryptographic hash function compresses arbitrarily long messages to digests of a short and fixed length. Most of existing hash functions are designed to evaluate a compression function with a finite domain in a mode of operation, and the compression function itself is often designed from block ciphers or permutations. This modular design approach allows forrigorous security analysis with the help of both cryptanalysis and provable security [2].