TY - JOUR A2 - Chen, Chung-Hao AU - Lin, Kuang Tsan AU - Yeh, Sheng Lih PY - 2014 DA - 2014/03/13 TI - Hiding a Covert Digital Image by Assembling the RSA Encryption Method and the Binary Encoding Method SP - 603659 VL - 2014 AB - 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. SN - 1024-123X UR - https://doi.org/10.1155/2014/603659 DO - 10.1155/2014/603659 JF - Mathematical Problems in Engineering PB - Hindawi Publishing Corporation KW - ER -