A first digital image is combined with a transformed first digital image
to authenticate and reconstruct the first digital image. When viewed in
the standard manner, the combined image appears to be the first digital
image. The transformed first digital image cannot be seen. When the bits
within each pixel of the combined image are reversed, i.e. the least
significant bit (LSB) is exchanged with the most significant bit (MSB),
and the resultant image is viewed, then the transformed first digital
image is seen. In this way, the transformed first digital image can be
hidden inside the noise bits of the first digital image. The method is
applied to color pixels by treating each color byte independently. The
transformed first digital image can be encrypted before combining with
the first digital image. The transformed first digital image can be
inversely transformed back to the first digital image for authentication
and reconstruction.