Separable Reversible Data Hiding With Data Optimization for Minimum Loss to Original Image

Vrishali Gaikwad, Todmal S. R.

Abstract: In this paper, the problem of transmitting large amount of data over an insecure, communication channel with minimum loss to the image in which the data is hidden is discussed. A data owner encrypts the data using a secret key. The secret key is taken and LFSR algorithm is applied to the secret key to obtain a set of unique keys. Each key from the set is embedded with the actual data and checked against the image?s pixel bit values (LSB of RGB channel) as to obtain the optimal index, using this index the data will be hidden into the image, so that it causes minimum change in the original image?s pixel bit values (Noise reduction).Once the data is hidden into the image using the optimal index the image is then encrypted in parallel using the encryption key (reducing encryption time) to obtain the encrypted stego image. This image at receiver?s end can be decrypted with the decryption key and the original data can be obtained from the image only if the receiver has the secret key. If the receiver has both the data-hiding key(secret key) and the encryption key, the receiver can extract the additional data and the original image without any loss.

Keywords: LFSR; AES; Image recovery; Datahiding; LSB replacement; UIQI