From: Jan Svitok <jan.svitok@...>
Date: 2007-03-01T17:30:13+09:00
Subject: Re: least significant bit ?

On 3/1/07, q666 <q666@wp.pl> wrote:
> Hi
> I have a question about Steganography in ruby how could i write and read
> some data (bits) from a picture (for example a bmp file) hmm heh i think
> i known something about how the LSB works //i read the wikipedia ;) but
> i have problem whit the source i dont know how to write it. ? :(

if you can read and write bytes of the picture you can set any bit by

byte |= 1 << bit_position (zero based)

011110010 | (1 << 2) == 011110010 | 100 = 011110*1*10

clearing a bit:

byte &= ~(1 << bit_position)

(at least this is the general idea, I might be a bit wrong ;-)