BibTeX:

@article{IJIRSTV3I1073,
     title={Survey on Several Data Hiding Scheme for Encrypted Image by Reserving Space},
     author={Prof. Archana M. Nayak, Prof. Kaushik S. Patel, Prof. Kaushal T. Kevadia and Prof. Brijesh U. Patel},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={3},
     number={1},
     pages={382--385},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV3I1073.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

Nowadays, due to explosive growth in the usage of internet the security of sensitive data becomes one of the prime concerns. For this purpose, various data hiding techniques are in used. So Reversible Data Hiding (RDH) in encrypted image is in used due to its excellent property which is original cover can be recovered with no loss after extraction of the embedded data. It provides image content’s confidentiality, security and authentication. Formerly all the methods use vacate room after the encryption (VRAE) method but the difficult with that is sometimes faults are occurred at the time of retrieval of original image. So we use reversible data hiding by reserving room before the encryption. Basically this paper describes the overview of previously used techniques for space allocation of encrypted data inside an image can be done before or after the image encryption.

Reversible Data hiding, vacate room after the encryption