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Password with a length of one to eight characters

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Reference no: EM132400997

Can someone explains how to calculate below? Especially the N calculation, I would like the whole answer. Someone only gave me the N part earlier.

A system allows the user to choose a password with a length of one to eight characters, inclusive. Assume that 10,000 passwords can be tested per second. The system administrators want to expire passwords once they have a probability of 0.10 of having been guessed. Determine the expected time to meet this probability under each of the following conditions.

  1. Password characters may be any ASCII characters from 1 to 127, inclusive.
  2. Password characters may be any alphanumeric characters ("A" through "Z," "a" through "z," and "0" through "9").
  3. Password characters must be digits.

Reference no: EM132400997

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