esoterik

require 'rmagick'
require 'chunky_png'

# Simple least significant bit steganography. Hides a message in the 
# least significant bit of the red channel of the image.
#
# Requires ImageMagick, Ruby 2.5,  rmagick gem, chunky_png gem
#
# To encode a message:
#   ruby lsb.rb encode image_file message encdoded_filename

esoterik

def substitute(art, count)
  split = art.split ""
  spaces = split.each_index.select { |i| split[i] == " " }
  to_alter = spaces.sample(count)

  to_alter.each { |i| split[i] = "\u2800" }
  split.join ""
end

ascii = ["