Originally posted on the Cambium Community Networks  Just in case you missed it cnMaestro Version 2.2.1 (Cloud and On-Premise), brings us a great new feature called ePSK. If you’re not familiar with ePSK it’s maybe because Cambium are too modest to toot their own trumpet so I’m going to do it for them.  In short ePSK gives each user a unique PSK (pre-shared key) when using WPA2-Personal, for me to explain why this is such a useful feature let me first explain the problem with using a shared PSK across the whole WLAN.  When a wireless client connects to an AP it completes a 4-Way handshake, this generates the encryption keys used to encrypt wireless traffic. For the 4-way handshake to work it is a requirement that both the client and AP know the passphrase, however the passphrase is never transmitted over the air thereby making this exchange reasonably secure.  But what happens when a 3rd party already knows the passphrase? It means they just need to capture the 4-way handshake to gener...