integers followed by a string of six lowercase characters. The characters may be reused but the integers may not. a) How many such passwords are possible? b) If you are trying to guess a password with this scheme and you know that the password has '123' as its unique integers, what is the probability you guess the password on the first try? c) If you know that the password contains 123 as its unique integers and contains the letter 'a' somewhere, what is the probability you guess the password on the first try?
integers followed by a string of six lowercase characters. The characters may be reused but the integers may not. a) How many such passwords are possible? b) If you are trying to guess a password with this scheme and you know that the password has '123' as its unique integers, what is the probability you guess the password on the first try? c) If you know that the password contains 123 as its unique integers and contains the letter 'a' somewhere, what is the probability you guess the password on the first try?
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
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Suppose a password protection protocol requires the use of three unique positive
integers followed by a string of six lowercase characters. The characters may be reused
but the integers may not.
a) How many such passwords are possible?
b) If you are trying to guess a password with this scheme and you know that the
password has '123' as its unique integers, what is the probability you guess the
password on the first try?
c) If you know that the password contains 123 as its unique integers and contains the
letter 'a' somewhere, what is the probability you guess the password on the first
try?
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