How strong is your password

May 12, 2011

By Utkarsh

If you invited me to try and crack your password, you know the one that you use over and over for like every web page you visit, how many guesses would it take before I got it?

Let’s see… here is my top 10 list. I can obtain most of this information much easier than you think, then I might just be able to get into your e-mail, computer, or online banking. After all, if I get into one I’ll probably get into all of them.

Your partner, child, or pet’s name, possibly followed by a 0 or 1 (because they’re always making you use a number, aren’t they?)
The last 4 digits of your social security number.
123 or 1234 or 123456.
“password”
Your city, or college, football team name.
Date of birth – yours, your partner’s or your child’s.
“god”
“letmein”
“money”
“love”

Statistically speaking that should probably cover about 20% of you. But don’t worry. If I didn’t get it yet it will probably only take a few more minutes before I do…

Hackers, and I’m not talking about the ethical kind, have developed a whole range of tools to get at your personal data. And the main impediment standing between your information remaining safe, or leaking out, is the password you choose. (Ironically, the best protection people have is usually the one they take least seriously.)

One of the simplest ways to gain access to your information is through the use of a Brute Force Attack. This is accomplished when a hacker uses a specially written piece of software to attempt to log into a site using your credentials. Insecure.org has a list of the Top 10 FREE Password Crackers right here.

So, how would one use this process to actually breach your personal security? Simple. Follow my logic:

You probably use the same password for lots of stuff right?
Some sites you access such as your Bank or work VPN probably have pretty decent security, so I’m not going to attack them.
However, other sites like the Hallmark e-mail greeting cards site, an online forum you frequent, or an e-commerce site you’ve shopped at might not be as well prepared. So those are the ones I’d work on.
So, all we have to do now is unleash Brutus, wwwhack, or THC Hydra on their server with instructions to try say 10,000 (or 100,000 – whatever makes you happy) different usernames and passwords as fast as possible.
Once we’ve got several login+password pairings we can then go back and test them on targeted sites.
But wait… How do I know which bank you use and what your login ID is for the sites you frequent? All those cookies are simply stored, unencrypted and nicely named, in your Web browser’s cache. (Read this post to remedy that problem.)

And how fast could this be done? Well, that depends on three main things, the length and complexity of your password, the speed of the hacker’s computer, and the speed of the hacker’s Internet connection.

Assuming the hacker has a reasonably fast connection and PC here is an estimate of the amount of time it would take to generate every possible combination of passwords for a given number of characters. After generating the list it’s just a matter of time before the computer runs through all the possibilities – or gets shut down trying.

Pay particular attention to the difference between using only lowercase characters and using all possible characters (uppercase, lowercase, and special characters – like @#$%^&*). Adding just one capital letter and one asterisk would change the processing time for an 8 character password from 2.4 days to 2.1 centuries.

Password Length	All Characters	Only Lowercase
3 characters 4 characters 5 characters 6 characters 7 characters 8 characters 9 characters 10 characters 11 characters 12 characters 13 characters 14 characters	0.86 seconds 1.36 minutes 2.15 hours 8.51 days 2.21 years 2.10 centuries 20 millennia 1,899 millennia 180,365 millennia 17,184,705 millennia 1,627,797,068 millennia 154,640,721,434 millennia	0.02 seconds .046 seconds 11.9 seconds 5.15 minutes 2.23 hours 2.42 days 2.07 months 4.48 years 1.16 centuries 3.03 millennia 78.7 millennia 2,046 millennia

Remember, these are just for an average computer, and these assume you aren’t using any word in the dictionary. If Google put their computer to work on it they’d finish about 1,000 times faster.