Jano Svitok
3/1/2007 8:30:00 AM
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 ;-)