A Survey Of Lossless And Reversible Data Hiding In Encrypted Images

Computer engineering

A system for lossless and reversible data hiding in encrypted images proposes a lossless, a reversible, and a combined data hiding schemes. To add one more level of security the scheme is applied for cipher text images. The cipher text is then encrypted by public key cryptosystems. The first scheme is lossless scheme. In this scheme, the cipher text pixels are replaced with new values. The replacement of pixel is done to embed the additional data into several LSB-planes of cipher text pixels by multi-layer wet paper coding. Then, the embedded data can be directly extracted from the encrypted domain, and the data embedding operation does not affect the decryption of original plaintext image. The second scheme is reversible scheme. In this scheme, a preprocessing is employed to shrink the image histogram before image encryption, so that the modification on encrypted images for data embedding will not cause any pixel oversaturation in plaintext domain. From the decrypted image we can then find the embedded data and the original image in spite of slight distortion. The third and final scheme is the combined scheme i.e. combination of lossless and reversible scheme. With the combined technique, there are two possible outcomes. A receiver may extract a part of embedded data before decryption, and extract another part of embedded data and recover the original plain text image after decryption. In literature survey it was noticed that some of the previous system do not differentiate between the two system I.e. reversible and lossless system. It is also noticed that if data embedding capacity increases then the image quality decreases. The existing system tries to overcome all these flaws.

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