Creating Short Length Masks using Vertical Processing

摘要

Masking can be used to create a onetime pad for extracting a message from a cover image. Using the most significant bit of a color band in an image will provide considerable space in which to mask out a short message of up to 2000 characters. When using the most significant bit we can avoid changes in the data when the file is converted between file formats such as bmp to jpg. This paper presents a study of vertical versus horizontal (raster) processing of bitmap images for determining a mask length. Results show that by processing the image in a column wise fashion we can achieve an 8 to 10 fold savings in mask length.