The WEP algorithm is intended to protect wireless communication from eavesdropping. A secondary function of WEP is to prevent unauthorized access to a wireless network.
WEP encrypts the payload of data packets. Management and control frames are always transmitted in the clear. WEP uses the RC4 encryption algorithm. The shared-secret key is either 40 or bits long. The key is chosen by the system administrator. In the ad hoc mode, each station is a peer to the other stations and communicates directly with other stations within the network.
No AP is involved. All stations can send Beacon and Probe frames. A station in the infrastructure mode communicates only with an AP. Together they operate as a fully connected wireless network. This field uniquely identifies each BSS. Both the station and AP radiate and gather The format of frames is illustrated below.
Most of the frames contain IP packets. The other frames are for the management and control of the wireless connection. The management frames establish and maintain communications. These are of Association request, Association response, Reassociation request, Reassociation response, Probe request, Probe response, Beacon, Announcement traffic indication message, Disassociation, Authentication, Deauthentication types.
The SSID is part of several of the management frames. The control frames help in the delivery of data. The payload part of the datagram is WEP-encrypted. In the open system authentication, all stations are authenticated without any checking.
A station A sends an Authentication management frame that contains the identity of A, to station B. Station B replies with a frame that indicates recognition, addressed to A. The shared key authentication uses a standard challenge and response along with a shared secret key.
All the APs transmit Beacon frames a few times each second that contain the SSID, time, capabilities, supported rates, and other information. The association is a two-step process. A station that is currently unauthenticated and unassociated listens for Beacon frames.
The station selects a BSS to join. The station and the AP mutually authenticate themselves by exchanging Authentication management frames. The client is now authenticated, but unassociated. In the second step, the station sends an Association Request frame, to which the AP responds with an Association Response frame that includes an Association ID to the station.
The station is now authenticated and associated. A station can be authenticated with several APs at the same time, but associated with at most one AP at any time. There is no state where a station is associated but not authenticated. Sniffing is eavesdropping on the network. A packet sniffer is a program that intercepts and decodes network traffic broadcast through a medium.
Sniffing is the act by a machine S of making copies of a network packet sent by machine A intended to be received by machine B.Study an Improvisation Method for Detecting Spoofed Attack in Wireless LAN R R.
|Introduction||Many of these tools rely on using a faked MAC address, masquerading as an authorized wireless access point or as an authorized client. Using these tools, an attacker can launch denial of service attacks, bypass access control mechanisms, or falsely advertise services to wireless clients.|
|Detecting MAC Layer Spoofing Using Received Signal Strength - Semantic Scholar||This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution CC-BY license http: Abstract Media access control MAC addresses in wireless networks can be trivially spoofed using off-the-shelf devices.|
|Trust issues with your firewalls?|
Agale1, S V. Athawale2 Department of Computer Engineering, AISSMS COE, Savitribai Phule Pune University This section illustrates the pros and cons of different MAC address spoof detection methods.
For securing a network from attack like. spoofing!. the CTS/RTS message scheme helps prevent collisions on the wireless network medium.!. this presents unique challenges on wireless! networks as depicted in Figure 5.!
Before A transmits its data deauthentication attacks. Detecting and Localizing Wireless Spoofing Attacks Yingying Chen, Wade Trappe, Richard P. Martin have been proposed to detect the spoofing attacks in wireless networks. ,  have introduced a secu- Recall that the MAC address is typically used as a unique identifier for all the nodes on the network.
Further, for most . MAC address spoofing is a technique that is used to change the MAC address used on the network card. A MAC address is factory-assigned from the manufacturer and it is hard coded. By changing the MAC address an attacker can pretend to be another user or conceal his own MAC address on a wireless or wired network.
Detecting Wireless LAN MAC Address Spoofing Joshua Wright, GCIH, CCNA [email protected] I demonstrate two methods of detecting wireless LAN (WLAN) MAC address spoofing. I also show how these methods can be used to detect the activity of devious WLAN MAC address to match the authenticated client before communicating on the network.
MAC addresses can be easily spoofed in wireless LANs. An adversary can exploit this vulnerability to launch a large number of attacks. For example, an attacker may masquerade as a legitimate access point to disrupt network services or to advertise false services, tricking nearby wireless stations.