The '''Lightweight Extensible Authentication Protocol''' (LEAP) is a proprietary wireless LAN authentication method developed by [[Cisco Systems]]. Important features of LEAP are dynamic [[Wired Equivalent Privacy | WEP]] keys and [[mutual authentication]] (between a wireless client and a [[RADIUS]] server). LEAP allows for clients to reauthenticate frequently; upon each successful authentication, the clients acquire a new WEP key (with the hope that the WEP keys don't live long enough to be cracked). LEAP may be configured to use TKIP instead of dynamic WEP.
Some 3rd party vendors also support LEAP through the Cisco Compatible Extensions Program.<ref>{{citewebcite web|title=Cisco Compatible Extensions Program|url= http://www.cisco.com/web/partners/pr46/pr147/partners_pgm_concept_home.html |publisher=cisco.com Cisco |accessdate=2008-022-22}}</ref>▼
▲Some 3rd party vendors also support LEAP through the Cisco Compatible Extensions Program.<ref>{{citeweb|title=Cisco Compatible Extensions Program|url=http://www.cisco.com/web/partners/pr46/pr147/partners_pgm_concept_home.html|publisher=cisco.com|accessdate=2008-02-22}}</ref>
== Security Considerations ==
Cisco LEAP, similar to [[Wired Equivalent Privacy|WEP]], has had well-known security weaknesses since 2003 involving offline password cracking.<ref>{{citewebcite web| title = Cisco LEAP dictionary password guessing|url=http://xforce.iss.net/xforce/xfdb/12804|publisher=iss ISS |accessdate=2008-3-03}}</ref> LEAP uses a modified version of [[MS-CHAP]], an [[authentication]] protocol in which user credentials are not strongly protected. Stronger authentication protocols employ a [[salt (cryptography)|salt]] to strengthen the credentials against eavesdropping during the authentication process. Cisco's response to the weaknesses of LEAP suggests that network administrators either force users to have stronger, more complicated [[passwords]] or move to another authentication protocol also developed by Cisco, [[EAP-FAST]], to ensure security.<ref>{{citeweb|title=Cisco Security Notice: Dictionary Attack on Cisco LEAP Vulnerability|url=http://www.cisco.com/warp/public/707/cisco-sn-20030802-leap.shtml | publisher = Cisco |accessdate= 2008-2-22}}</ref> Automated tools like ASLEAP demonstrate the simplicity of getting unauthorized access in networks protected by LEAP implementations.<ref>{{citeweb|title=asleap|url= http://asleap.sourceforge.net/| publisher= Sourceforge | accessdate = 2008-032-0322}}</ref>
LEAP uses a modified version of [[MS-CHAP]], an [[authentication]] protocol in which user credentials are not strongly protected. Stronger authentication protocols employ a [[salt (cryptography)|salt]] to strengthen the credentials against eavesdropping during the authentication process. Cisco's response to the weaknesses of LEAP suggests that network administrators either force users to have stronger, more complicated [[passwords]] or move to another authentication protocol also developed by Cisco, [[EAP-FAST]], to ensure security.<ref>{{citeweb|title=Cisco Security Notice: Dictionary Attack on Cisco LEAP Vulnerability|url=http://www.cisco.com/warp/public/707/cisco-sn-20030802-leap.shtml|publisher=cisco.com|accessdate=2008-02-22}}</ref> Automated tools like ASLEAP demonstrate the simplicity of getting unauthorized access in networks protected by LEAP implementations.<ref>{{citeweb|title=asleap|url=
