I’m wondering where I can find good collections of dictionaries which can be used for dictionary attacks?
I've found some through Google, but I’m interested in hearing about where you get your dictionaries from.
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Nice list collected by Ron Bowes you can find here:
Other list is from InsidePro:
An important one that hasn't been added to the list is the crackstation wordlist
The list contains every wordlist, dictionary, and password database leak that I could find on the internet (and I spent a LOT of time looking). It also contains every word in the Wikipedia databases (pages-articles, retrieved 2010, all languages) as well as lots of books from Project Gutenberg. It also includes the passwords from some low-profile database breaches that were being sold in the underground years ago.
Best thing is, its free, although you can (and should!) make a donation!
Some additional ones to add to those already suggested
Try the CrackLib dictionaries: https://web.archive.org/web/20161225012801/http://linux.maruhn.com/sec/cracklib-dicts.html
I tested the likelihood of collisions of different hashing functions. To help test, I tried hashing
all 216,553 words in the English language. Start with those 17.7 bits.
then the list of all 2,165,530 English words with one digit after it. (21.0 bits)
then the list of all
21,655,300 English words with two digits after it. (24.4 bits)
then the list of all
524,058,260 English words with a possible capital as the first letter, and followed by zero, one, or two digits. (29.0 bits).
With one list of English words you'll cover nearly everyone's password.
Note: XKCD is always relevant
Another good source is here http://blog.g0tmi1k.com/2011/06/dictionaries-wordlists/
[Analysis] Dictionaries & Wordlists
In general, it's said that using a GOOD 'dictionary' or 'wordlist' (as far as I know, they're the same!) is 'key'. But what makes them GOOD? Most people will say 'the bigger, the better'; however, this isn't always the case... (for the record this isn't my opinion on the matter - more on this later).
You'll find lots of words in lots of languages on the download page for the English Wiktionary. enwiktionary-latest-all-titles-in-ns0.gz contains just page titles, including phrases - it might have underscores instead of spaces though. (we have English definitions of words from many languages).
And of course there's also WordNet.
(sorry but as a newbie I can only include one link)
All the posts so far have great information, but remember you can always generate word lists yourself with a utility like crunch.
If you have an idea of what the password parameters are (for example, has to be 8-10 chars with only letters and numbers, no symbols), you can pipe crunch to most bruteforce programs with the tailored parameters.
This is one that I have found useful over the years:
It includes popular passwords, fuzzing based on attack type and popular user names.
Have you considered instrumenting OpenSSH to log password attempts. Its common to log thousands of attempts every day for an internet connected host. That will give you a list of several thousand common passwords that have some track record of success AND hint at users other than root which are common targets (e.g. nagios, db admins etc). Once you have a list then you can then use cewl to generate many more variations of these basic passwords.
I'd also recommend looking up lists of male/female names: a huge number of passwords are based on name. Again, once you have a basic list using cewl on it will generate many variations.