key2 = {}

change = function(section)
  returnstring = ""
  charable = {}
  for i=1, #section do
    table.insert(charable, string.sub(filestring, i,i))
  end
  for i=#charable, 1, -1 do
    returnstring = returnstring..charable[i]
  end
  return returnstring
end

changemax = function(filestring2)
currentstring = {}
table.insert(currentstring, filestring2)
for q=2, 1000 do
  thisstring = ""
  current = 1
  while true do
    w = current + q
    select = string.sub(currentstring[q-1], current, w-1)
    thisstring = thisstring..change(select)
	if w-1 >= #filestring2 then
	  table.insert(currentstring, thisstring)
	  break
	end
	current = current + q
  end
end
return currentstring[999]
end

ppio = 0
linesop = {}
print("file:")
cryptfile = read()
file = fs.open(cryptfile, "r")
while true do
  filestring = file.readLine()
  for i=1, 10 do
    curline = file.readLine()
    if curline == nil then
      break
    end
    filestring = filestring.."&"..curline
  end
  if curline == nil then
    break
  end
  table.insert(linesop, filestring)
  ppio = ppio+1
end
file.close()

shell.run("delete", "cryptfile")
file = fs.open(cryptfile, "w")
for ioi=1, ppio do
  file.writeLine(changemax(linesop[ioi]))
end
file.close()