City Guilds Model Questions Vol1 2023 Information Technology Question 24
Practice objective / multiple choice question 24 from the 2023 City Guilds Model Questions Vol1 Information Technology examination.
A system stores passwords as SHA‑256 hashes. An attacker can compute \(5\times10^{9}\) hashes per second. The password policy requires passwords of exactly 8 characters, each character being an uppercase letter (26), a lowercase letter (26) or a digit (10).\ (a) Calculate the total number of possible passwords and the time (in hours) required for the attacker to exhaust the entire key space. (b) The security policy states that the time to brute‑force a password must exceed 100 years. Does the current 8‑character policy satisfy this requirement? If not, what is the minimum password length (still using the same 62‑character set) that meets the 100‑year threshold?
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This is City Guilds Model Questions Vol1 2023 Information Technology Question 24. It is one of the objective questions from the 2023 City Guilds Model Questions Vol1 Information Technology examination.
Difficulty level: Hard .
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