java barcode api open source Identify and Describe WLAN Security Techniques in Software

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Identify and Describe WLAN Security Techniques
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I quickly converted the data to a format that could be used by the WEP cracking tool I was using and then ran the cracking tool against the data In about three seconds the entire group was looking at the WEP key I asked the attendee who had entered it if it was the right one, to which he replied, Wow! Yeah This information was not news to people who work with WLANs every day The conference group, however, had not been exposed to the speed at which WEP could be cracked The total time, including the time spent by the attendee entering the WEP key and then my capturing of the data during transfer, was just over six minutes Normally an attacker does not need to take time to enter a WEP key, so if there is sufficient traffic on the WLAN, the attacker can usually capture enough data to get the WEP key in three to five minutes and then crack it in three to five seconds Even if there is insufficient traffic, methods are available to force the generation of enough traffic so that the attacker can gather the needed data
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Some newer WLAN devices intentionally avoid weak Initialization Vectors and make it much more dif cult to crack the WEP key In fact, they make it impossible to crack the WEP key in
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three to ve minutes at this time A deep understanding of Initialization Vectors is not required for the CWTS exam or to con gure a WLAN, but you should know that they are a major reason for WEP s weaknesses
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With the weaknesses found in the WEP implementation, the IEEE began development of a more secure authentication and encryption algorithm While they were developing what eventually became an amendment to IEEE 80211 as 80211i, the WiFi Alliance created a certification known as WPA The WPA2 certification is based on the ratified IEEE 80211i document, and WPA was based on part of the 80211i draft document available at an earlier time Today, documents often refer to WPA/WPA2 as if they are the same thing, but differences do exist For example, WPA does not implement the Advanced Encryption Standard (AES) encryption and WPA2 does However, both can be implemented using passphrases or authentication servers When implemented with an authentication server, they are more secure, assuming a strong EAP type is used WPA2 is a mandatory feature for all new equipment that receives the WiFi Certification from the WiFi Alliance
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When using a passphrase and preshared key (PSK) to authenticate client STAs using WPA or WPA2, there is a known vulnerability An attacker can listen for the four-way handshake that is involved in the WPA authentication process and use the CoWPAtty tool, as one example, to discover the passphrase If the attacker does not capture a four-way handshake quickly, she can transmit a disassociation frame to the client station causing it to process the four-way handshake again With the handshake frames, knowledge of the SSID, and a dictionary of possible passwords or passphrases, the attacker can eventually retrieve the passphrase and PSK This type of attack is often called WPA cracking The primary protection against this attack, at this time, is to use enterprise-class security instead of the PSK To accomplish this, implement an EAP type that is secure, such as PEAP or EAP-TTLS, instead of using passphrases You are likely to find yourself in an organization, if you install many WLANs, that cannot or will not support a full authentication infrastructure It will usually happen in SOHO installations or SMBs Solutions to this latter scenario include TinyPEAP, but in most cases you can use a longer passphrase that is not a word at all (something like gu7YjhU67BbrYYZ89klop09) and gain enough security for these installations According to some researchers, it could take years to brute-force a passphrase like the one represented here even with a P4 38 GHz processor Even a longer passphrase can be very weak For example, my company s name is SYSEDCO I could set the PSK passphrase to SYSEDCO43040, which is my company s name and my ZIP code However, even though it s long, it could be easily guessed and should be avoided
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