Chapter 3, Problem 47CRP

Explanation of Solution

Determine the time required to test all possible passwords:

The password consists of string of nine characters from English alphabet.

There are $26$ English alphabets.

• To find the number of possible passwords, multiply $26$ nine times as shown below:

  $\begin{array}{c}\text{Number}\text{of}\text{passwords}\text{possible}=26\times 26\times 26\times 26\times 26\times 26\times 26\times 26\times 26\\ =5429503678976\end{array}$

The time taken for each password to be tested is “$1milli\sec ond$”