City Guilds Model Questions Vol1 2019 Information Technology Question 9

Practice objective / multiple choice question 9 from the 2019 City Guilds Model Questions Vol1 Information Technology examination.

City Guilds Model Questions Vol1 2019 Information Technology Objective / Multiple Choice Hard Difficulty

Question 9 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2019 • INFORMATION_TECHNOLOGY • objective

A system encrypts data with AES‑256 in CBC mode using a random 128‑bit IV. An attacker can try \(10^{9}\) keys per second. Assuming the key is uniformly random, estimate the expected time (in years) for the attacker to find the correct key by exhaustive search. Give your answer in scientific notation rounded to two significant figures.

Answer Options

Correct Answer A. 1.8×10^60 years

B. 2.5×10^59 years

C. 9.0×10^60 years

D. 1.2×10^61 years

Correct Answer

Correct Option:

1.8×10^60 years

About This Question

This is City Guilds Model Questions Vol1 2019 Information Technology Question 9. It is one of the objective questions from the 2019 City Guilds Model Questions Vol1 Information Technology examination.

Difficulty level: Hard .

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