Assume that passwords are selected from four-character
combinations of 26 alphabetic characters. Assume that an
adversary is able to attempt passwords at a rate of one per
second.
a) Assuming no feedback to the adversary until each attempt
has been completed, what is the expected time to discover
the correct password?
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Answer Posted / joel
Did none of you ever learn about combinations and permutations in math class? Have you ever wondered what the nCr and nPr buttons do on your calculator? If you are to make a combination of 4 out of 26 possible choices, 26 nCr 4 = 14,950 possible different combinations. That is 14,950 seconds. 14,950/60 = 249.17 minutes / 60 = 4.15 hours...
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