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I want someone to help me solve this.

An attacker is hitting the right username after 80% failed attempts after every five minutes.

I got failure %, and time. What is the fail ratio how can i find it? Consider there are 100 usernames.

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can you define fail ratio? –  oks Apr 5 '13 at 17:55
    
I have revised my question? is it ok –  asadz Apr 5 '13 at 22:42
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