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Password strength is a measurement of the effectiveness of a password as an authentication credential. Specifically, it estimates how many trials an attacker who does not have direct access to the password would need, on average, to correctly guess it. The strength of a password is a function of length, complexity, and randomness.

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Wikipedia About Password Strength

Password strength is a measurement of the effectiveness of a password as an authentication credential. Specifically, it estimates how many trials an attacker who does not have direct access to the password would need, on average, to correctly guess it. The strength of a password is a function of length, complexity, and randomness.

Using strong passwords lowers overall risk of a security breach, but strong passwords do not replace the need for other effective security controls. The effectiveness of a password of a given strength is strongly determined by the design and implementation of the authentication system software, particularly how frequently password guesses can be tested by an attacker and how securely information on user passwords is stored and transmitted. Risks are also posed by several means of breaching computer security which are unrelated to password strength. Such means include: wiretapping, phishing, keystroke logging, social engineering, dumpster diving, side-channel attacks, software vulnerabilities etc.

Determining password strength

There are two primary ways passwords are created, automatically (using randomizing equipment) or by a human. The strength of randomly chosen passwords can be calculated with precision. More commonly, passwords are generated by asking a human to choose a password, typically guided by a set of rules or suggestions; an example is at account creation time for computer systems. In this case, only estimates of strength are possible, since humans tend to follow patterns in such tasks. In addition, lists of commonly chosen passwords are widely available for use in password guessing programs. All passwords on such lists are considered weak, as are passwords that are simple modifications of entries in such lists. Either can be quickly tried. For some decades, investigations of passwords on multi-user computer systems have shown that 40% or more are readily guessed using only computer programs, and more can be found when information about a particular user is taken into account during the attack. Fact: date=September 2008

Entropy or bit strength

It is standard in the computer industry to measure password strength in terms of information entropy, a concept from information theory. Instead of the number of guesses needed to find the password, the base-2 logarithm of that number is taken to be the equivalent of the number of "bits" in a password. A password with, say, 42 bits of strength as calculated this way would be as strong as a string of 42 random bits. Put another way, a password with 42 bits of strength would require 242 attempts to exhaust all possibilities. Thus, adding a bit of entropy (or its equivalent) to a password doubles the number of guesses required. On average, an attacker will have to try half the possible passwords before finding the correct one.

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Talk:Password strength - Wikipedia, the free encyclopedia

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News about Password Strength

Barnes Group Inc. Responds to Ongoing Boeing Labor Strike

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Test Center: Sandbox security versus the evil Web

InfoWorld via Yahoo! News The Internet is a scary place. Criminal malware lurks on legitimate and illegitimate Web sites alike, looking to steal your money one way or the other.http://news.yahoo.com/s/infoworld/20080930/tc_infoworld/1110...

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Daily SundialShai Wolman, a 23-year-old English literature student, glares at his laptop in disbelief as he is repeatedly denied connection to the campus wireless network, an issue the Information Technology Department (IT) is taking great pains to address with the limited funding available.http://sundial.csun.edu/wireless_network_still_experiencing_...

Alliance Worldwide moves, expands service area

BizJournalsA Latham firm will expand its offices for the third time in three years on the strength of rapid growth in workers’ compensation fraud investigations and employee background checks.http://www.bizjournals.com/albany/stories/2008/09/29/story7....

Photographers Help Grieving Parents Take the First Step in Healing

Washington PostA white rose hanging outside the doorway tells nurses that the family in this one room of the maternity ward at Inova Alexandria Hospital is different. It puts them on notice not to tiptoe around the curtain smiling, ready to coo at a sleeping baby and congratulate the new parents. That's because... http://www.washingtonpost.com/wp-dyn/content/article/2008/09...

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Hands on: Campus Explorer finds colleges, odds of admission

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THE POLITICAL LANDSCAPE:

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Posts of praise linked to officer

Augusta ChronicleWhen shown the entries, Sheriff Ronnie Strength said they would not appear to violate the law or sheriff's office policy if ... The Chronicle Web site allows registered users to sign in with a username and password that gives them access to stories ... http://chronicle.augusta.com/stories/101008/met_478926.shtml

What the meltdown means to me, a married 25-year-old without a house

Walletpop.comI share many of the same concerns as they do regarding the strength of our economy and the overall health of our financial ... When you enter your name and email address, you'll be sent a link to confirm your comment, and a password. To leave another ... http://www.walletpop.com/blog/2008/10/07/what-the-meltdown-m...

Rob's Newport Aquarium Riddle

Fox 19You'll play with cool new interactive shark stuff at the new Shark Alley exhibit where you can test your shark strength and ... You will then be prompted to enter your personal password. After your password has been entered click "Login" and this will ... http://www.fox19.com/Global/story.asp?S=4979775&nav=menu63_7...

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Password Strength | drupal.org

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BlackPlanet.com - About Password Strength

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Ext.ux.PasswordMeter

Password field with strength meter. These forms do not do anything and have very little validation. They solely demonstrate how you can use Ext Forms to build and layout forms on ... http://testcases.pagebakers.com/PasswordMeter/
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Answers for Password Strength

RibbonsHow do I use a free wireless internet service?RibbonsAsk the owner of the ISP. Sometimes you need to use a user name and or password to use the wireless internet service. It will be free but you have to ask.MDF2How to connect your PSP to the internet using "2 wire 2701hgv" router?MDF2#1. what firmware is your psp #2. what type of security do you have on your router #3. what encryption is your security on your router #4. have you been able to connect other things to the router ...WeLcOmeHow javascript works...?WeLcOmeMarWhy won't Yahoo let me reset my Password because of formatting problems?Marchange your password http://help.yahoo.com/l/us/yahoo/mail/yahoomail/account/account-03.html if your old password (current password) still not working, ask for new password, then change it. http:...stephanie slinksys router setup help pls? It says i am connected with signal strength excellent...but not on the internetstephanie s
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