City Guilds Model Questions Vol1 2025 Information Technology Question 30
Practice objective / multiple choice question 30 from the 2025 City Guilds Model Questions Vol1 Information Technology examination.
An organisation requires passwords of length 10 drawn from uppercase (26), lowercase (26), digits (10) and special symbols (12). Each password must contain at least one character from each category and must not contain any 3‑character substring that appears in a list of 500 compromised sequences. Assuming the forbidden substrings are uniformly distributed, estimate the effective password space. Then, if an attacker can test \(10^{9}\) passwords per second, compute the average time (in years) to exhaust the space (i.e., half the space). Round the time to two decimal places.
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This is City Guilds Model Questions Vol1 2025 Information Technology Question 30. It is one of the objective questions from the 2025 City Guilds Model Questions Vol1 Information Technology examination.
Difficulty level: Hard .
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