ABSTRACT :
In the last few years, visual privacy has become
a major problem. Because of this, encrypted image processing
has received a lot of attention within the scientific and business
communities. Data hiding in encrypted images (DHEI) is an
effective technique to embed data in the encrypted domain.
The owner of an image encrypts it with a secret key and it
is still possible to embed additional data without knowing the
original content nor the secret key. This secret message can be
extracted and the initial image can be recovered in the decoding
phase. Recently, DHEI has become an investigative field, but the
proposed methods do not allow a large amount of embedding
capacity. In this paper, we present a new method based on the
MSB (most significant bit) prediction. We suggest to hide one bit
per pixel by pre-processing the image to avoid prediction errors
and, thereby, to improve the quality of the reconstructed image.
We have applied our method to various images and, in every
cases, the obtained image is very similar to the original one in
terms of PSNR or SSIM.
