A Review Paper on Reversible Data Hiding In Encrypted Images by Reserving Room before Encryption

In digital era, lots of data is generated over web and in local data exchange mediums. Private companies, government organizations, internet users, etc. are prime source of data generators over globe. As loads of data is generated every day, security and integrity of data becomes the most important factor. Confidentiality of data is prime key of concern of every organization working in digital world. In this paper, we introduce a novel technique in which data is encrypted in images and then transmitted to client (user). In this paper, for hiding data in encrypted images we use Reversible Data Hiding (RDH) using reserving room in advance approach. By using this approach we can recover image without any loss of data. Previous system use to vacant room before encryption which may result in some errors or attacks by intruders which causes defect in confidentiality of data. In our proposed system, image recovery and data extraction are free from any errors and attain real reversibility. In this paper, AES encryption algorithms, visual cryptography algorithm for colored images, LSB based steganography, algorithms are implemented on various data patterns. The algorithms are compared and evaluated on accuracy and its ability to reproduce original data.