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Attacks Against the WPA Algorithm
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Like its WEP predecessor, WPA has been hit by every hacker with low REM sleep Although some offline attacks have been birthed, there have been no slam-dunk attacks yet However, while the attacks and weaknesses found in the 80211i standard were minimal compared to WEP, they were and remain to this day significant forms of attack
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Aircrack-ng (http://wwwaircrack-ngorg/dokuphp) is one of a series of wireless hacking tools from WirelessDefenceorg The tool will take a captured WPA handshake from a tool like Wireshark and perform an offline dictionary attack on it If the WPA PSK (Pre-shared Key) is short enough, in minutes you will have the crown jewels of the air: the passphrase Once you ve recorded the 4-way handshake, run the aircrack-ng tool on your captured handshake You can fire up your trusty Linux image and type:
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-a designates the type of attack mode (1/WEP, 2/WPA-PSK) w designates the dictionary file you wish to use, and the last parameter is the captured handshake
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There are a number of ways to perform a Denial of Service (DoS) attack against WPA networks The two types of DoS attacks fall into either the deauthentication or the flooding category We have typically refrained from detailing DoS attacks on networks, and wireless is no exception However, here are a few to get your juices flowing: Deauthentication Authentication and/or Beacon Flood aireplay-ng mdk3
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There are numerous resources on the Internet that discuss other DoS attacks in detail For a high level resource, check out SANS s whitepaper at https://www2sansorg/ reading_room/whitepapers/wireless/2108php
Securing WPA
WPA is not immune to hacker attacks, but its solid security design and the lessons learned from the past with WEP have allowed WPA to evolve into a significant deterrent to the fly-by-night hacker The primary defense mechanism to WPA attack is quite simple: strong Pre-Shared Keys (PSK) Strong PSKs mean providing random sequence of alphanumeric values of at least 10 bytes If you can deploy your WPA device with a strong enough PSK, then you can thwart almost any common WPA attack today Now, how long this will last is, of course, up to the hackers Stay tuned
ADDITIONAL RESOURCES
A decibel-to-watts conversion is helpful for identifying the signal strength of a wireless access point or wireless card Table 8-1 can be utilized to determine the retrieved decibel to the power equivalent The power equivalent can then be analyzed to determine the estimated strength of the signal
dBm 53 50 49 48 47 46 45 44 43 42 41
V 100 707 64 58 50 445 40 325 32 28 262
Po 200 W 100 W 80 W 64 W 50 W 40 W 32 W 25 W 20 W 16 W 125 W
Table 8-1
Decibel-to-Volts-to-Watts Conversion
8:
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dBm 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12
V 225 20 18 16 141 125 115 10 9 8 71 64 58 5 445 4 355 32 28 252 225 2 18 16 141 125 115 1 09
Po 10 W 8W 64 W 5W 4W 32 W 25 W 2W 16 W 125 W 10 W 800 mW 640 mW 500 mW 400 mW 320 mW 250 mW 200 mW 160 mW 125 mW 100 mW 80 mW 64 mW 50 mW 40 mW 32 mW 25 mW 20 mW 16 mW
Table 8-1
Decibel-to-Volts-to-Watts Conversion (continued)
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dBm 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
V 08 071 064 058 05 0445 04 0355 032 028 0252 0225 02 018 016 0141 0125 0115 01 009 008 0071 0064 0058 005 0045 004 00355
Po 125 mW 10 mW 8 mW 64 mW 5 mW 4 mW 32 mW 25 mW 20 mW 16 mW 125 mW 10 mW 80 mW 64 mW 50 mW 40 mW 32 mW 25 mW 20 mW 16 mW 125 mW 10 mW
Table 8-1
Decibel-to-Volts-to-Watts Conversion (continued)
8:
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