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BackTrack is the most Top rated linux live distribution focused on penetration testing. With no installation whatsoever, the analysis platform is started directly from the CD-Rom and is fully accessible within minutes. Back Track 2
It`s evolved from the merge of the two wide spread distributions Whax and Auditor Security Collection. By joining forces and replacing these distribution the BackTrack could gain a massive popularity and was voted in 2006 as #1 at the surveil of insecure.org. Security professionals as well as new-comers are using it as their favorite toolset all over the globe.
BackTrack