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lab3 - fgdump-Linux – shadow file(unshadow Memory...

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Mark Shtern
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Passwords are the most common authentication method They are inherently insecure
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Human generated passwords Come from a small domain Easy to guess – dictionary attacks Stronger passwords Computer generated or verified Not user friendly Hard to remember
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Physical Access Offline password cracking Online password cracking
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Boot using Linux bootable CD Mount system drive Reset Administration Password (Windows: chntpwd; Linux modify shadow file)
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Collect password hashes Crack passwords
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Eavesdropping (Sniffing) Password file - Windows – SAM,NTDS.dit file (pwdump[ 2-6 ] and
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Unformatted text preview: fgdump)-Linux – shadow file (unshadow) Memory Dump (debug tools: WinDgb, gdb), System calls (APImonitor, strace) SQL database, configuration file Source code Types-Brute Force -Dictionary-Hybrid-Rainbow The most popular crackers-Windows: Ophcrack, Cain & Abel, LCP-Linux: John the Ripper (john) Eavesdropping: Encrypt the channel, e.g. using SSL or SSH Offline dictionary attacks: Limit access to password hashes, strong passwords, password lifetime, use salt Online dictionary attacks: Delayed answers, strong passwords, account lockouts...
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