Hi All,
Based on recent password discussions on the DC404 group, I've created a
simple spreadsheet which calculates the average time to crack a password
with any given amount of entropy. By default, the spreadsheet shows
entropy lines from 50 to 128 bits in increments of .25 bits. You can
change the starting entropy setting and the increment. The number of
total calculation lines remains the same. You can also change the crack
engine speed, which defaults to 100 billion guesses / second.
Conservative but simplistic recommendations are given for calculating
entropy with passwords involving words, digits, and symbols, based on
(my interpretation of) discussions with David Tomaschik. If you want to
run numbers for a specific entropy, such as 4 words @ 15.8 bits each =
63.2 bits, just put that in as the starting entropy and the answers will
show up on the first line.
I mainly built this to scratch my own itch, but anyone is welcome to use
it. Let me know what you think. If you want to use it or post it
outside this forum, please give me credit and post the file on something
besides my dropbox account.
https://dl.dropboxusercontent.com/u/9879631/entropy-crack-time.xls
I've tried to check the math, but you may wish to hand check a couple of
lines before using it.
Sincerely,
Ron
--
(PS - If you email me and don't get a quick response, you might want to
call on the phone. I get about 300 emails per day from alternate energy
mailing lists and such. I don't always see new email messages very quickly.)
Ron Frazier
770-205-9422 (O) Leave a message.
linuxdude AT techstarship.com
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