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by jpgoldberg
Wed Nov 07, 2012 4:16 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1131: "Math"
Replies: 156
Views: 33082

Confidence interval in forecast?

In the comic, what is the confidence interval for the shown forecast? Note that immediately prior to polls closing 538 predicted a 91% chance of an Obama win in the electoral college and almost certainly something less than that for the popular vote (I can't seem to find it now.) So if the comic is ...
by jpgoldberg
Thu Aug 11, 2011 8:29 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0936: "Password Strength"
Replies: 893
Views: 320858

Re: 0936: "Password Strength"

Can someone explain Wolfram|Alpha says that is going to take a billion years to crack and the comic says 3 days? Alpha, along with every other password strength checker, is forced to assume that the strength is a function of the length and character set used. But that is an incorrect assumption. In...
by jpgoldberg
Thu Aug 11, 2011 7:19 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0936: "Password Strength"
Replies: 893
Views: 320858

Re: 0936: "Password Strength"

Having done some brute force password cracking this comic isn't truthful to real life from my experience. May I ask what tools you used? My understanding is that John the Ripper has a system of plug-in rule sets, including those that look for exactly the same kind described in the first panel.[/quo...
by jpgoldberg
Thu Aug 11, 2011 3:30 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0936: "Password Strength"
Replies: 893
Views: 320858

Re: 0936: "Password Strength"

make it upper and lower case, add numbers and symbols in random places But people don't randomly add upper case. They do it at the beginning, end, and at syllable boundaries. The same is true about adding numbers and symbols "randomly". People don't do it that way, and are highly predicta...
by jpgoldberg
Thu Aug 11, 2011 2:20 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0936: "Password Strength"
Replies: 893
Views: 320858

Re: 0936: "Password Strength"

This particular comic has said in a few panels what I've gone to great length to explain elsewhere. I love it. I've now posted an explanation of why this comic gets it right for people unfamiliar with some of the concepts and math. The crucial concept is that that strength of a password comes not fr...

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