Network RAM

modemSide = "back"
modem = peripheral.wrap(modemSide)
modem.open(93)
turtle = {}
testForExist = {}
notExists = true
secretPass = "Ehfks87-i"
secretPass2 = "sgxyg&%UI33%^&HS34DH-N"
turtlePort = 512

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

function makeString(l)
        if l < 1 then return nil end -- Check for l < 1
        local s = "" -- Start string
        for i = 1, l do
                s = s .. string.char(math.random(32, 126)) -- Generate random number from 32 to 126, turn it into character and add to string
        end
        return s -- Return string
end

function authentificationServer(port)
    authPass = false
    rndString = tostring(makeString(math.random(8,20)))
    modem.transmit(57,port,textutils.serialize({"authentification",encrypt.encrypt(rndString,secretPass)}))
    qevent, qside, qch1, qch2, qmsg = os.pullEvent("modem_message")
    qmsgTab = textutils.unserialize(qmsg)
    if encrypt.decrypt(qmsgTab[2],secretPass2) == rndString then
        authPass = true
    end
    return authPass
end

function authentificationClient(port)
    qevent, qside, qch1, qch2, qmsg = os.pullEvent("modem_message")
    modem.transmit(65529,port,encrypt.encrypt(encrypt.decrypt(qmsg,secretPass),secretPass2))
end

clear()

while true do
    notExists = true
    event, side, ch1, ch2, msg = os.pullEvent("modem_message")
    clear()

    print("h")
    msgTab = textutils.unserialize(msg)
    if msgTab[1] == "turtle" and ch2 == 1 then
        print("1st cond")
        if authentificationServer(turtlePort) == true then
            print("h")
            for i,v in pairs(turtle) do
                print(i..v)
                testForExist = textutils.unserialize(turtle[i])
                if testForExist[1] == msgTab[2] then
                    notExists = false
                end
            end
            print("i")
            if notExists == true then
                turtle[#turtle + 1] = textutils.serialize({msgTab[2],msgTab[3],msgTab[4],msgTab[5]})
            end
        end
    elseif msgTab[1] == "turtle" and ch2 == 2 then
        print("msg")
        modem.transmit(324,1,textutils.serialize(turtle))
    end
end