eric and case-sensitive. Show your calculation steps and provide an explanation of how you arrived at the answer. Why is the entropy an approx

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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Question 10 

Determine the minimum required length for a password to have at least 128 bits of entropy. The password is alphanumeric and case-sensitive.

Show your calculation steps and provide an explanation of how you arrived at the answer.

Why is the entropy an approximation and not a true reflection of the strength of a password?   

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