Abstract: The present invention provides a robust and effective solution to an organization by enabling them to implement a system (110) for facilitating format preserving encryption capability such that the encrypted data will not be available with its original value in a big data system and render sensitive field data as non-sensitive. Thus, sensitive data may be hidden from data-stores/warehouses without worrying about downstream access to the data. The system (110) proposed may also preserve the data type and format of datasets but not limited to the like. The system encrypts a dataset with a unique key (404) and then allows a privileged user (902) to decrypt the encrypted dataset with the unique key (404) and view the decrypted values without getting access to the sensitive original dataset.