[Pxtl]

The ones used by security experts are in the GB range.

Obviously you could do more efficient approaches like converting characters to recognize that P@ssw0rd is just Password, but then you've increased the algorithmic complexity you're sending to the client. If you want to get super-fancy, you've got to find word boundaries and whatnot to find that MyP45512345 is really just MyPass12345.

Of course, the simple brute force approach (server-side check if my password in this 5GB db of passwords?) might be too slow to use for this case anyways.

[colejohnson66]

> The ones used by security experts are in the GB range.

Citation? The only multi gigabyte "dictionaries" I've seen are rainbow tables. I'm genuinely curious why you'd need multiple gigabytes when the Dictionary.com app a few years ago was no more than 200 megabytes.