Calculate the key space for 128-bit keys and compare that to the key space for 10-character passwords (lower case English alphabetic, upper case English alphabetic, 10 digits and 14 special characters are allowed). How many characters does a password following the above rules must have to achieve the same or better security as 128-bit random keys if the passwords would be chosen randomly?

Management Of Information Security
6th Edition
ISBN:9781337405713
Author:WHITMAN, Michael.
Publisher:WHITMAN, Michael.
Chapter12: Protection Mechanisms
Section: Chapter Questions
Problem 19RQ
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Calculate the key space for 128-bit keys and compare that to the key space for 10-character passwords (lower case English alphabetic, upper case English alphabetic, 10 digits and 14 special characters are allowed).

How many characters does a password following the above rules must have to achieve the same or better security as 128-bit random keys if the passwords would be chosen randomly?

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