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Diceware
Arnold G. Reinhold published a word list and method of rolling dice to look up words to make random passwords. Here you can generate passwords using the Diceware word list in the convenience of your web browser. The Diceware website has detailed instructions and security tips such as: Discard any short passwords or passwords that are recognizable phrases. The frequently asked questions has a wealth of information:
The Diceware word list is used here with permission under the Creative Commons CC-BY 3.0 license. Although the contents of the word list have not been altered, it has been reformatted into the JavaScript source code that powers this page.
Password Creator
This password generator is on passwordcreator.org. The home page has a variety of random password styles available.
Suggest Diceware Passwords on Your Website
PasswordCreator.org can power a list of secure randomly generated Diceware passwords on your website. Put a list of suggested passwords on your website near where you ask your users to choose a password.
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How Secure is Your Password
Diceware
7776 possible words
Average time to crack based on number of guesses per second
Size
Possible combinations
1 trillion (expected future capability)
100 billion (large distributed system)
1 billion (distributed system or supercomputer)
100 million (small distributed system)
1 million (single computer)
2
60.5 million
instant
instant
instant
instant
30 seconds
3
470 billion
instant
2 seconds
4 minutes
39 minutes
3 days
4
3.66 quadrillion
3 minutes
5 hours
21 days
7 months
58 years
5
28.4 quintillion
16 days
5 years
5 centuries
45 centuries
-
6
221 sextillion
4 centuries
351 centuries
-
-
-
7
1.72 octillion
-
-
-
-
-
8
13.4 nonillion
-
-
-
-
-
Diceware with Symbols
7776 possible words and 36 possible symbols in a random location
Average time to crack based on number of guesses per second