startup

while true do
  term.clear()
  term.setCursorPos(1, 1)
  print("Please Enter Password:")
  local input = read("*")
  if input == "Markus2000" then
    redstone.setOutput("back", true)
    local state = true

    while state == true do
      term.setCursorPos(1, 1)
      term.clear()
      print("Press C to Close the Door")
      local event, keystroke = os.pullEvent("char")
      if keystroke == "c" then
        redstone.setOutput("back", false)
        print("Door Close")
        state = false
      end
    end
  end
end