Thank you for the thoughtful reply!
You don't want to expose the salt to the client - but without salt hashing doesn't give better security.
Yes, I should have been more clear on this - I would take a hash of only the password on the client side, say SHA-512 multiple times, and additionally do the same hashing+salt on the server. That way, the cleartext password is never seen by the server, and provided the hash isn't in a rainbow table somewhere, it adds a tiny bit more security.
All of your points are excellent, and yes, I see that perhaps a per-IP delay or lockout on too many attempts might even be better than the current implementation (in Mojo: $c->tx->remote_address). Even though I agree logging is very important, did leave it out of this example... but luckily Mojo makes it fairly easy to add: app->log->warn("..."), app->log->error("...") and so on, and it can be redirected into a database as well via the event mechanism built into Mojo::Log.
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.