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I wouldn't go so far as to say that "Invalid login" fails to buy any security - it prevents users from trivially determining whether a username is valid or not, thus significantly increasing the search space for a brute-force attack. Not a silver bullet by any means (not even a very shiny one, really), but still enough to be significant in many cases.

(Yeah, escalating delays are good, too, but a little trickier to implement in an environment, such as CGI, where you can't reliably maintain state.)


In reply to Re: Re: Essential CGI Security Practices by dsheroh
in thread Essential CGI Security Practices by cjf

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