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ComputingWhy are PassPhrases better than AlphaNumeric Passwords?(self.askscience)
submitted 8 years, 1 month ago by [deleted] to /r/askscience (26.2m)
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I read very recently that our password system is completely backwards. We encourage long passwords t...

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[–]mfukarParallel and Distributed Systems | Edge Computing1 point8 years, 1 month ago

Second, I was looking at this completely wrong. I was essentially thinking ONLY of what I would call a “brute force” attack. Wherein an automated system would just continually try random characters until it finally hit. In that instance, it doesn’t seem to me like it would matter what the digits were.

"Intelligence" does not factor into this at all. Your formulation is a bit curious; what do you think is different in a brute-force attack and, as you describe it, "an automated system [which] would just continually try random characters until it finally hit"?

To reiterate, it does not matter what the replacement rules are. Since they are known by the attacker, they construct the attempted passwords in the same way as you.

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[–][deleted]2 points8 years, 1 month ago

what do you think is different in a brute-force attack and, as you describe it, "an automated system [which] would just continually try random characters until it finally hit"?

Nothing. That was my explanation of what I was calling a Brute Force attack. I didn't know if I was using the term correctly, so I described it. "Wherein" not "Whereas".

Let me try to explain why I think intelligence matters. To keep this very simple, lets say the rules are "Password must contact minimum 2 characters" and "One character must be a number".

What I am trying to call a Brute Force attack would be given those rules and then start with a1. If that doesn't work, b1. etc etc until it finally hits something. However, an intelligent attacker would know that I was born May 15th (not actually true) and my dog's name is Susie (not actually true), so may try Susie515 a lot sooner than the "non-intelligent" attacker would.

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[–]mfukarParallel and Distributed Systems | Edge Computing1 point8 years, 1 month ago

Thanks. I figured as much, as this is a common misconception when it comes to entropy estimation. From the top:

If you're not picking your password randomly and uniformly, an attacker who knows YOU knows what to look for.

And conversely, an attacker that is brute-forcing passwords knowing YOUR birthday is May 15th, is attacking YOU, because that is the best way to spend their resources.

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