©　2003　IEEE.Motivated　by　the　problem　of　wireless　data　link　layer　security,　this　paper　proposes　SPRiNG,　a　simple　protocol　for　secure　point-to-point　communication.　SPRiNG　uses　synchronized　pseudo　random　number　generation　to　generate　authenticator　variables　and　fresh　encryption　keys　on　a　per　frame　basis.　A　major　design　goal　for　SPRiNG　was　simplicity　and　compatibility　with　the　existing　802.11b　WEP　protocol.　Though　motivated　by　wireless　security,　SPRiNG　is　generic　and　can　be　applied　anywhere　secure　point-to-point　communication　is　required.　Unlike　many　proposed　security　schemes,　SPRiNG　demonstrates　that　security　does　not　always　necessitate　complexity.