Lecture 8 - Wireless Security - Wireless Security Lecture 8...

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Wireless Security Lecture 8
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Outline 1. Wireless intro & history 2. Wireless network modes 3. SSID 4. WEP 5. WPA 6. WPA2 7. Wireless Network tools 8. References
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Background & Overview History Developed for military use Security widely noticed after Peter Shipley’s 2001 DefCon preso on War Driving DHS labeled Wi-Fi a terrorist threat, demanded regulation Non Wi-Fi types CDPD 19.2 kbps analog GPRS 171.2 kbps digital WAP bandwidth-efficient content delivery Ricochet 176 kbps wireless broadband flop Bluetooth personal area networks, range limited only by transmit power Blackberry Use cellular & PCS networks, no authentication at console IEEE 802 series standards 802.11 wireless LANs 802.15 wireless personal area networks (e.g., Bluetooth) 802.16 wireless broadband up to 155Mb, wireless ISPs
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802.11 Standards 802.11a 54 [email protected] GHz Not interoperable with 802.11b Limited distance Dual-mode APs require 2 chipsets, look like two APs to clients Cisco products: Aironet 1200 802.11b 11 [email protected] GHz Full speed up to 300 feet Coverage up to 1750 feet Cisco products: Aironet 340, 350, 1100, 1200 802.11g 54 [email protected] GHz Same range as 802.11b Backward-compatible with 802.11b Speeds slower in dual-mode Cisco products: Aironet 1100, 1200
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802.11 Standards (Cont.) 802.11e QoS Dubbed “Wireless MultiMedia (WMM)” by Wi -Fi Alliance 802.11i Security Adds AES encryption Requires high cpu, new chips required TKIP is interim solution 802.11n (2009) up to 300Mbps 5Ghz and/or 2.4Ghz ~230ft range 802.11ac (under development) Will provide high through put in the 5 GHz band Will use wider RF bandwidth will enable multi-station WLAN throughput of at least 1 Gbps a maximum single link throughput of at least 500 Mbps
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Wireless Network Modes The 802.11 wireless networks operate in two basic modes: 1. Infrastructure mode 2. Ad-hoc mode Infrastructure mode: each wireless client connects directly to a central device called Access Point (AP) no direct connection between wireless clients AP acts as a wireless hub that performs the connections and handles them between wireless clients
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Wireless Network Modes (cont’d) The hub handles: the clients’ authentication, Authorization link-level data security (access control and enabling data traffic encryption) Ad-hoc mode: Each wireless client connects directly with each other No central device managing the connections Rapid deployment of a temporal network where no infrastructures exist (advantage in case of disaster…) Each node must maintain its proper authentication list
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SSID Service Set Identification SSID is the service set identifier or network name for the basic service set(BSS).
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  • Spring '16
  • Cryptography, Wireless network, Wi-Fi Protected Access, WEP

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