Test File 3 (free)

local _seclevel = 3
local sides = {"top", "bottom", "left", "right", "front", "back"}
local _monitor, _drive= "", ""
local mon = peripheral.wrap("monitor_0")
local _passwords = {"5BCE0FE268FA6B4B801FB1082F185B90000AB1258202C653F64B4F037D172336", "9EA9B8889DE45FA608597CB52B79749E2E32C97EF6481CFE6B315655933331F8", "387B8E8247FE18FFFA39FA2DFCDFB555633A0585B6F7D781FFCDA8E82AA20232", "51B92A735030BDBF16100656E55D9F98D0CACA269266782E2F3E850894898BEE", "7B48A89633F05F625E007F3287CD3858584503B9972578791D321851C9D44E51"}

for i=1, #sides do
    if peripheral.isPresent(sides[i]) then
        if peripheral.getType(sides[i]) == "monitor" then
            _monitor = sides[i]
        end
        if peripheral.getType(sides[i]) == "drive" then
            _drive = sides[i]
        end
    end
end

term.clear()
term.setCursorPos(1,1)

mon.clear()
mon.setBackgroundColor(colors.black)
mon.setTextColor(colors.white)
mon.setCursorPos(2,3)
mon.write("Ready")

while true do
    event, side = os.pullEvent()

    if event == "disk" then
        local time = os.time()
        local formattedTime = textutils.formatTime(time, false)
        local data
        local check = "blank"
        local passwordMatch = -1
        if fs.exists("disk/password") then
            local file = fs.open("disk/password","r")
            data = file.readLine()
            file.close()
            for i=1, #_passwords do
                if data == _passwords[i] then
                    passwordMatch = i
                end
            end

            if passwordMatch == -1 then
                mon.setBackgroundColor(colors.red)
                mon.setTextColor(colors.black)
                mon.clear()
                mon.setCursorPos(1,2)
                mon.write("Access")
                mon.setCursorPos(1,4)
                mon.write("Denied")

                print("- Invalid Password. TIME:" .. formattedTime)

                -- PASSWORD INVALID (DO STUFF HERE)

            elseif passwordMatch < _seclevel then
                mon.setBackgroundColor(colors.red)
                mon.setTextColor(colors.black)
                mon.clear()
                mon.setCursorPos(1,2)
                mon.write("Higher")
                mon.setCursorPos(1,3)
                mon.write("Access")
                mon.setCursorPos(1,4)
                mon.write("Required")

                print("- Low Access. TIME:" .. formattedTime)

                -- NEED HIGHER ACCESS CARD (DO STUFF HERE)

            elseif passwordMatch >= _seclevel then
                mon.setBackgroundColor(colors.green)
                mon.setTextColor(colors.black)
                mon.clear()
                mon.setCursorPos(1,2)
                mon.write("Access")
                mon.setCursorPos(1,4)
                mon.write("Granted")

                print("- Access granted. Level " .. passwordMatch .. " card. TIME:" .. formattedTime)

                -- ACCESS GRANTED (DO STUFF HERE)

            end
        else
            mon.setBackgroundColor(colors.red)
            mon.setTextColor(colors.black)
            mon.clear()
            mon.setCursorPos(1,2)
            mon.write("Invalid")
            mon.setCursorPos(1,3)
            mon.write("Access")
            mon.setCursorPos(1,4)
            mon.write("Card")

            print("- Unformatted Card. TIME:" .. formattedTime)

            -- INVALID ACCESS CARD (DO STUFF HERE)
        end

        peripheral.call(_drive, "ejectDisk")

        os.sleep(4)
    end

    mon.setBackgroundColor(colors.black)
    mon.setTextColor(colors.white)
    mon.clear()
    mon.setCursorPos(2,3)
    mon.write("Ready")

end