On Wed, Jul 15, 2009 at 11:10 AM, Marko Kreen<mark...@gmail.com> wrote:

> From security standpoint, wasting more cycles on bad passwords is good,
> as it decreases the rate bruteforce password scanning can happen.
>
> And I cannot imagine a scenario where performance on invalid logins
> can be relevant..

DoS attacks. The longer it takes to reject an invalid login, the fewer
invalid login attempts it takes to DoS the server.

-- 
- David T. Wilson
david.t.wil...@gmail.com

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