================================================================                  ____  _            _                 / ___|| |_ __ _ ___| |__                 \___ \| __/ _` / __| '_ \                  ___) | || (_| \__ \ | | |                 |____/ \__\__,_|___/_| |_|                         VERSION: 0.3              Copyright (C) 2003 Peter Kieltyka                        Jan 27, 2003                    Updated: Mar 25, 2006================================================================Contents:[1] What is Stash?[2] Usage information[3] License[4] Misc-- [1] What is Stash? ------------------------------------------Stash is a basic steganography program that hides a file within a bitmapimage without disrupting the appearance of the original image. It uses asimple algorithm that replaces the least significant bit of a random setof bytes from the pixel data of the bitmap image with a bit of the secretdata. The bits are distributed throughout the container file (BMP) asdetermined by the password supplied to seed the PRNG.-- [2] Usage information --------------------------------------- Usage Examples:   To Hide:     ./stash "image1.bmp" "image2.bmp" "secret.txt" "hello123"   To Extract:     ./stash "image2.bmp" "secret.txt" "hello123" Tested on:  - Windows XP  - FreeBSD 4.7  - Debian Linux 3.0  - Mac OS X 10.3 TODO:  - Implement AES cipher to encrypt the data before hiding it  - Add JPEG/WAV/MPG support-- [3] License -------------------------------------------------Stash is licensed under the BSD license. See the attached LICENSE file.-- [4] Misc ----------------------------------------------------code notes:===========  when hiding:  a = (a & ~1) | (((b >> (7-k)) & 1) & 1);  this takes the bit of byte 'b' at location 'k' (k goes from 0-7, 0 being the LSB)  and stores it in the LSB of byte 'a'  when extracting:  a = (a & ~(1 << (7-k))) | ((b & 1) << (7-k));  this assigns 'a' the LSB of 'b' to location 'k' (k goes from 0-7, 0 being the LSB)