What is Message-Locked Encryption

In the present digital scenario, data is of prime significance for individuals and moreover for organizations. With the passage of time, data content being produced increases exponentially, which poses a serious concern as the huge amount of redundant data contents stored on the cloud employs a severe load on the cloud storage systems itself which cannot be accepted. Therefore, a storage optimization strategy is a fundamental prerequisite to cloud storage systems. Data deduplication is a storage optimization strategy that is used for deleting identical copies of redundant data, optimizing bandwidth, improves utilization of storage space, and hence, minimizes storage cost. To guarantee the security parameter, the data which is stored on the cloud must be in an encrypted form to ensure the security of the stored data. Consequently, executing deduplication safely over the encrypted information in the cloud seems to be a challenging job. This chapter discusses various existing data deduplication techniques with a notion of securing the data on the cloud that addresses this challenge.