н/л, но блин, удивительные вещи творятся порой.

http://techterms.com/definition/handshake
http://dict.kolbi.ru/cgi-bin/dict2/view2.pl

Ну и в тексте у вас в принципе объяснено довольно подробно имхо и с картинками:

RSNA establishment procedure consists of 802.1X authentication and key management protocols. Three entities are involved, called the Supplicant (the wireless station), the Authenticator (the Access Point), and the Authentication Server (de facto a RADIUS server
[34]). Generally, a successful authentication means that the supplicant and the authenticator verify each other’s identity and generate some shared secret for subsequent key derivations. Based on this shared secret, the key management protocols compute and distribute usable keys for data communication sessions. The authentication server can be implemented either in a single device with the authenticator, or through a separate server, assuming the link between the authentication server and the authenticator is physically secure. The complete
handshakes of establishing a RSNA are shown in Figure 1.
For the purpose of analysis, these steps can be divided into 6 stages as follows

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