Majority of the selected NIST PQC lattice-based schemes use a variant of the _____ as their underlying hard problem.

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BlackTom AI · Accepted Answer

Question restatement: The prompt asks about the underlying hard problem used by the majority of lattice-based PQC schemes in the NIST candidate families.
Option a: Elliptic Curve Discrete Logarithm Problem (ECDLP). This problem is central to elliptic-curve cryptography, not lattice-based schemes. It is unrelated to the lattice structure and the hardness assumptions typical for NIST PQC lattice designs, so this choice is inaccurate.
Option b: Integer Factorization Problem. Factorization underpins RSA and related public-key systems, not lattice-based constructions. Lattice schemes rely on lattice problems rather than factoring, making this option incorrect.
Option c: Learning With Errors (LWE) Problem. This is the canonical hard problem used in many lattice-based cryptosystems, and indeed a large portion of NIST PQC lattice candidates are built on LWE or close relatives like Ring-LWE. The hardness of solving noisy linear equations over rings provides the security basis for these schemes, so this is the correct choice.
Option d: Discrete Logarithm Problem (DLP). DLP is foundational for certain group-based cryptosystems (e.g., classic Diffie-Hellman over groups), but it is not the standard hardness assumption for lattice-based schemes. Lattice-based designs do not rely on DLP, so this option is incorrect.
In summary, the lattice-based PQC landscape is dominated by reductions to problems like LWE (and related Ring-LWE), while the other listed problems belong to different cryptographic paradigms. Hence, the statement in option c correctly identifies the underlying hard problem most lattice-based NIST PQC schemes use.

FIT1093_S2_2025 Week 7 MCQ: Post Quantum Cryptography

Majority of the selected NIST PQC lattice-based schemes use a variant of the _____ as their underlying hard problem.

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FIT1093_S2_2025 Week 7 MCQ: Post Quantum Cryptography

Majority of the selected NIST PQC lattice-based schemes use a variant of the _____ as their underlying hard problem.

View Explanation

Log in for full answers

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