IPSec (IP Security) protocols provide mechanisms for establishing security associations between pairs of devices. In fact, IPSec may be used to establish private end-to-end communications between pairs of computers, so that an additional layer of security is imposed above and beyond whatever Wi-Fi controls may be in place. This mechanism is quite similar to that used in VPNs (virtual private networks), in which additional security is used to make connections across inherently unsecure links.
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