A password system uses exact 8-character of alphanumeric. To be a secure password system, any password cannot contain the following keywords: (a) All numbers. I.e., must contain at least one letter in the password. (b)User's name. What is the probability of an adversary guessing John Hank's password correctly?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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A password system uses exact 8-character of alphanumeric. To be a secure password system, any password cannot contain the following keywords:

(a) All numbers. I.e., must contain at least one letter in the password.

(b)User's name.

What is the probability of an adversary guessing John Hank's password correctly?

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