Take the 2-minute tour ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

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.

share|improve this question
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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.