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[arstechnica] 25-GPU cluster cracks every standard Windows password in <6 hours - Page 12

post #111 of 144
Quote:
Originally Posted by ghostrider85 View Post

if someone really want your files, there are lot of ways to gain access.

That's a gross generalization. It depends on where the files are. You can only brute force certain things.
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post #112 of 144
Quote:
Originally Posted by ghostrider85 View Post

what are we arguing about here? there is no such thing as absolute security.

Sure there is! Its called the OFF switch.
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post #113 of 144
Quote:
Originally Posted by That Guy View Post

C0r3ll!anBl00d$TR!P3
How long would it take to find that password using this method?

Doesn't matter which characters you choose, considering they all have an equal chance of being chosen if you're trying brute force. With rainbow tables for every single character/symbol, it wouldn't matter too much.

For example, you might have the 26 letters of the English alphabet. It doesn't matter which one you choose considering a computer probably won't have some bias or something towards one letter so each letter has a 1/26 chance of being chosen through brute force cracking.
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post #114 of 144
Quote:
Originally Posted by HybridCore View Post

Doesn't matter which characters you choose, considering they all have an equal chance of being chosen if you're trying brute force. With rainbow tables for every single character/symbol, it wouldn't matter too much.
For example, you might have the 26 letters of the English alphabet. It doesn't matter which one you choose considering a computer probably won't have some bias or something towards one letter so each letter has a 1/26 chance of being chosen through brute force cracking.

While what you're saying is true if they went through the possibilities sequentially, there are combinations that will usually get tried before all others based on statistics of the most-used passwords out there. Included in these databases are any "leetspeak" words as well, meaning words spelled with similar-looking characters.

Your best bet is to get a generator with all appropriate characters checked and go as random as possible.

Since we know Windows passwords are borderline useless against anyone who knows what they're doing, that's about the only one I would say to use something you can easily remember. Still don't make it anything stupid like a name, birthday, or anything easily personally-identifiable, though.
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post #115 of 144
Quote:
Originally Posted by ghostrider85 View Post

what are we arguing about here? there is no such thing as absolute security.
Yeah there is, one time pad is invulnerable to anything except brute force, and you can make a document so long that it would take longer than the expected life of the universe to brute force.
post #116 of 144
Quote:
Originally Posted by deletethegame View Post

Unsure about your current password?
http://howsecureismypassword.net/

Best thing you can do is enter your password into that website, guess who intercepts it.

When their quantum computers are up and running no encryption will be safe from the NSA.
Edited by Liranan - 12/10/12 at 7:46pm
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post #117 of 144
Quote:
Originally Posted by DrFPS View Post

Sure there is! Its called the OFF switch.
If you have physical access... you can freeze RAM and get a memory dump! smile.gif
Quote:
Originally Posted by Art Vanelay View Post

Yeah there is, one time pad is invulnerable to anything except brute force, and you can make a document so long that it would take longer than the expected life of the universe to brute force.
Quantum computing could beat a one time pad. (Plus there's the weakness of transferring and man-in-the-middle?)
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post #118 of 144
Just had to post this since we are on the subject.

I worked for a rather large company and thoer password was "urfired" without the quotes. SO any time the system went down and you had to fix it they would call and ask if anyone had computer knowledge so they did not have to send an outside company and pay for it.

I asked them if they was serius about the password. Now this is coming from the IT department and they said "yes, if you type it you know what happens to you."

I got a good laugh out of it.
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post #119 of 144
Mac is not secure at all (older outdated version 10.4.11)

I made my self a new account in seconds wiped the old one that was password protected
    
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post #120 of 144
Before NTLM was popular, I was cracking Windows XP SAM file with LM 14 char password for < 2 hours on Athlon Palamino XP 1600+, so nothing interesting about <6h on 25 GPU cluster.
Edited by metala - 12/11/12 at 2:43am
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