david mitchell 12 11 2007 n.
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Home Wireless Security - PowerPoint PPT Presentation


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David Mitchell 12/11/2007. Home Wireless Security. Home Wireless Security . Why? Open WEP WPA WPA2 . Why?. If you live in a house, your wireless network probably reaches to your neighbors. If you live in an apartment, your wireless network certainly reaches your neighbors.

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home wireless security
Home Wireless Security
  • Why?
  • Open
  • WEP
  • WPA
  • WPA2
slide3
Why?
  • If you live in a house, your wireless network probably reaches to your neighbors.
  • If you live in an apartment, your wireless network certainly reaches your neighbors.
  • Check your laptop. Can you see your neighbors wireless?
slide4
Why?
  • What are the risks?
  • Most likely is simply 'theft' of your service.
  • If the neighbors just do email and light web surfing, you would be unlikely to notice.
  • If you don't notice, do you care?
  • If your neighbors do much p2p downloading of music or movies, your connection may slow to a crawl. Then you would care.
slide5
Why?
  • Less likely but more serious risk is legal trouble.
  • There is a minuscule chance your neighbor would get the attention of the police by downloading child porn, hacking banks, emailing threats to the President, etc.
slide6
Why?
  • Slightly more likely is an RIAA filesharing lawsuit.
  • Over 20,000 have been filed as of July, 2006
  • If your neighbor uses your network to run their P2P applications, the RIAA may come after you.
  • You probably won't like the effect on your network speed either.
slide7
Why?
  • Just because there are risks doesn't mean you have to lock down your wireless.
  • Lots of individuals and businesses run open networks. In many cases, intentionally.
  • Coffee shops have them to increase business.
  • If you don't see a benefit, you should enable security to minimize your risk.
slide8
WEP
  • Wired Equivalent Privacy is the security in the original standard.
  • Supported by almost every 802.11 device.
  • Unfortunately, contained fatal design flaws.
  • Off the shelf tools can crack it passively in days, or actively in minutes.
slide9
WEP
  • Many devices began including '128' bit WEP instead of the 40 bit specified in the standard.
  • Each additional bit makes it twice as hard to crack in theory.
  • Or 295,147,905,179,352,825,856 times.
  • Previously mentioned flaws means its about three times as hard instead.
slide10
WPA
  • Interim 'standard' for wireless security.
  • Addressed the most severe flaws in WEP
  • Compatible with most older hardware
  • Uses the same RC4 encryption cipher that WEP uses
  • Has both Enterprise and Pre Shared Key (PSK) modes.
slide11
WPA2
  • WPA2 is the current standard defined via IEEE 802.11i.
  • Replaces RC4 cipher with stronger AES cipher.
  • Also has both Enterprise and PSK modes.
what to use
What To Use?
  • If you decide to protect your wireless, what should you do?
  • Disable SSID 'broadcast'.
  • Use the newest encryption supported by your devices.
  • Use a really random passphrase.
  • MAC address filtering: don't bother
what to do
What To Do?
  • Disable the network 'SSID' broadcast.
  • This doesn't increase security by much if any.
  • If you aren't going to let people use your network, there is no reason for it to advertise itself.
  • Akin to turning your porch light off on Halloween if you aren't giving out candy.
what to do1
What To Do?
  • Use the strongest security available on all your devices. Prefer WPA2 over WPA over WEP.
  • WPA is available for XP SP1 and OSX 10.3
  • WPA2 is available for XP SP2 and in OSX 10.4.
  • If you have WEP-only devices, consider replacing them.
what to do2
What To Do?
  • Use PSK (Pre Shared Key) mode.
  • May also be called “Personal” mode.
  • Enterprise mode would require you to run an authentication server at home.
  • Passphrase is subject to offline guessing attacks, so it should be really random.
  • You only have to type it in a few times so you don't have to be able to remember it.
wi fi protected setup
Wi-Fi Protected Setup
  • Newest addition
  • Tries to make it really easy to enable security in a home environment
  • Mandatory mode is to enter a PIN from the wireless card into the access point
  • Another is to have a button on both client and AP which must be pressed to enable them to sync up.
questions
Questions?
  • Any questions?