Hiding a Covert Digital Image by Assembling the RSA Encryption Method and the Binary Encoding Method

Abstract EN

The Rivest-Shamir-Adleman (RSA) encryption method and the binary encoding method are assembled to form a hybrid hiding method to hide a covert digital image into a dot-matrix holographic image.

First, the RSA encryption method is used to transform the covert image to form a RSA encryption data string.

Then, all the elements of the RSA encryption data string are transferred into binary data.

Finally, the binary data are encoded into the dot-matrix holographic image.

The pixels of the dot-matrix holographic image contain seven groups of codes used for reconstructing the covert image.

The seven groups of codes are identification codes, covert-image dimension codes, covert-image graylevel codes, pre-RSA bit number codes, RSA key codes, post-RSA bit number codes, and information codes.

The reconstructed covert image derived from the dot-matrix holographic image and the original covert image are exactly the same.