What is 4-way handshake in TCP?
A four-way handshake is a type of network authentication protocol established by IEEE-802.11i that involves standards set up for the construction and use of wireless local area networks (WLANs). The four-way handshake provides a secure authentication strategy for data delivered through network architectures.
What is 4-way handshake in wireless?
The 4-way handshake is the process of exchanging 4 messages between an access point (authenticator) and the client device (supplicant) to generate some encryption keys which can be used to encrypt actual data sent over Wireless medium.
How many bytes are in a TCP handshake?
TCP typically usually uses 24 bytes of the header for handshake (first two packets) and about 20 for normal packet transmission.
Why does TCP use the three-way handshake and four way handshake?
TCP uses a three-way handshake to establish a reliable connection. The connection is full duplex, and both sides synchronize (SYN) and acknowledge (ACK) each other. The exchange of these four flags is performed in three steps—SYN, SYN-ACK, and ACK—as shown in Figure 3.8.
Does WPA2 use 4-way handshake?
The RSNA is used in either a pre-shared key (PSK) or 802.1X SSID, in other words, WPA2-Personal or WPA2-Enterprise. The 4-Way Handshake utilizes an exchange of four EAPOL-Key frames between the client and access point. In a PSK network, the exchange of frames occurs after the Open System Authentication and Association.
What is PTK and GTK?
– Pairwise Transient Key (PTK) – The PTK is derived from the PMK and used in order to encrypt unicast frames with the client. – Group Transient Key (GTK) – The Group Transient Key (GTK) is derived from the GMK, and is used in order to encrypt multicast/broadcast on this specific SSID/AP.”
What happens TCP handshake?
The TCP handshake TCP uses a three-way handshake to establish a reliable connection. The connection is full duplex, and both sides synchronize (SYN) and acknowledge (ACK) each other. The exchange of these four flags is performed in three steps: SYN, SYN-ACK, ACK, as shown in Figure 5.8.
What are the 3 steps in a TCP handshake?
The TCP handshake The exchange of these four flags is performed in three steps: SYN, SYN-ACK, ACK, as shown in Figure 5.8. The client chooses an initial sequence number, set in the first SYN packet.
Why do we need 3-way handshake in TCP?
A three-way handshake is primarily used to create a TCP socket connection to reliably transmit data between devices. For example, it supports communication between a web browser on the client side and a server every time a user navigates the Internet.