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To handle the updating, 802.11i defines a Group Key Handshake that consists of a two-way handshake: The AP sends the new GTK to each STA in the network. The GTK is encrypted using the KEK assigned to that STA, and protects the data from tampering, by use of a MIC. The STA acknowledges the new GTK and replies to the AP.
The four-way handshake in 802.11i. Date: 4 January 2007: Source: Own work based on: ... This diagram uses embedded text that can be easily translated using a text editor.
The 4-way handshake involves: The AP sending a random number (ANonce) to the client. The client responding with its random number (SNonce). The AP calculating the PTK from these numbers and sending an encrypted message to the client. The client decrypting this message with the PTK, confirming successful authentication. [13]
Sequence diagram for a Wi‑Fi deauthentication attack. Unlike most radio jammers, deauthentication acts in a unique way. The IEEE 802.11 (Wi-Fi) protocol contains the provision for a deauthentication frame. Sending the frame from the access point to a station is called a "sanctioned technique to inform a rogue station that they have been ...
Handshaking is a technique of communication between two entities. However, within TCP/IP RFCs, the term "handshake" is most commonly used to reference the TCP three-way handshake. For example, the term "handshake" is not present in RFCs covering FTP or SMTP. One exception is Transport Layer Security, TLS, setup, FTP RFC 4217.
English: Asynchronous digital logic uses handshaking to ensure timing between circuits are robust to gate and wire delays. 2 and 4-phase handshakes are the two widely used handshaking protocols. Top: A sender and receiver are communicating over simple request and acknowledge lines.
The latest version is standardized in RFC 5247. The advantage of EAP is that it is only a general authentication framework for client-server authentication - the specific way of authentication is defined in its many versions called EAP-methods. More than 40 EAP-methods exist, the most common are: EAP-MD5; EAP-TLS; EAP-TTLS; EAP-FAST; EAP-PEAP
Elliptic-curve Diffie–Hellman (ECDH) is a key agreement protocol that allows two parties, each having an elliptic-curve public–private key pair, to establish a shared secret over an insecure channel.