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Suppose that a password for a computer system must have at least 8 , but no more than 1 2 , characters, where each character
Suppose that a password for a computer system must have at least but no more than characters, where each character in the password is a lowercase English letter, an uppercase English letter, a digit, or one of the six special characters and
a How many different passwords are available for this computer system?
b How many of these passwords contain at least one occurrence of at least one of the six special characters?
c Using your answer to part a determine how long it takes a hacker to try every possible password, assuming that it takes one nanosecond for a hacker to check each possible password.
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