Posted by
Guy Cox-2 on
URL: http://confocal-microscopy-list.275.s1.nabble.com/Password-Strength-tp6673797p6673962.html
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Martin,
It's probably right, but 1000 guesses per second would require a connection speed way beyond even what I get on campus to another on-campus computer. Even 100 per second (one month) seems implausible. At 10 guesses per second you're looking at 2½ years ... And any system that will allow you 268,435,456 attempts at logging in before it freezes you out is terminally insecure! (MS exchange allows 5 tries).
The four random words thing is fine provided that (a) only very few do it and (b) the words truly are random. But if it catches on then all a cracking algorithm has to do is try every combination of dictionary words that add up to the password length, a vastly simpler task.
Guy
Optical Imaging Techniques in Cell Biology
by Guy Cox CRC Press / Taylor & Francis
http://www.guycox.com/optical.htm______________________________________________
Associate Professor Guy Cox, MA, DPhil(Oxon)
Australian Centre for Microscopy & Microanalysis,
Madsen Building F09, University of Sydney, NSW 2006
Phone +61 2 9351 3176 Fax +61 2 9351 7682
Mobile 0413 281 861
______________________________________________
http://www.guycox.net
-----Original Message-----
From: Confocal Microscopy List [mailto:
[hidden email]] On Behalf Of Martin Wessendorf
Sent: Thursday, 11 August 2011 5:31 AM
To:
[hidden email]
Subject: Password Strength
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Dear List--
I can't say I've ever sent a link for a webcomic to the confocal list,
but here goes.
http://xkcd.com/936/(As far as I know, clicking on this link will not infect your computer
with a virus or take you to a porn site.)
Anybody able to verify or disprove this? Intuitively, it makes sense,
but so do a lot of things that are wrong.
Martin
--
Martin Wessendorf, Ph.D. office: (612) 626-0145
Assoc Prof, Dept Neuroscience lab: (612) 624-2991
University of Minnesota Preferred FAX: (612) 624-8118
6-145 Jackson Hall, 321 Church St. SE Dept Fax: (612) 626-5009
Minneapolis, MN 55455 e-mail:
[hidden email]
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