Neco 2023 Computer Studies Question 50

Practice objective / multiple choice question 50 from the 2023 Neco Computer Studies examination.

Neco 2023 Computer Studies Objective / Multiple Choice Medium Difficulty
Question 50 NECO • 2023 • COMPUTER_STUDIES • objective

A company uses a symmetric‑key algorithm with a \(128\)-bit key. An attacker can test \(10^{9}\) keys per second. Estimate the time required to exhaustively search the entire key space, express the result in years (rounded to two significant figures), and state whether a \(128\)-bit key provides adequate security against such an attacker (compare with a 10‑year security target).

Answer Options

A. ≈3.2×10^{21} years (far greater than 10 years, so the key length is adequate)
Correct Answer B. ≈1.1×10^{22} years (far greater than 10 years, so the key length is adequate)
C. ≈1.1×10^{12} years (far greater than 10 years, so the key length is adequate)
D. ≈1.1×10^{22} years (less than 10 years, so the key length is inadequate)
Correct Answer
B
Correct Option:
≈1.1×10^{22} years (far greater than 10 years, so the key length is adequate)

About This Question

This is Neco 2023 Computer Studies Question 50. It is one of the objective questions from the 2023 Neco Computer Studies examination.

Difficulty level: Medium .

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