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A COMPARATIVE ANALYSIS OF LWE BASED POST QUANTUM CRYPTOGRAPHIC SCHEMES: BALANCING CRYPTOGRAPHIC SECURITY, EFFICIENCY METRICS, AND IMPLEMENTATION FEASIBILITY IN THE POST QUANTUM TRANSITION ERA

Kainat Mubarik, Malik Aazaz Abbasi

Published Nov 29, 2025• 0 citations
Publisher
DOI
10.5281/zenodo.17777059

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A COMPARATIVE ANALYSIS OF LWE BASED POST QUANTUM CRYPTOGRAPHIC SCHEMES: BALANCING CRYPTOGRAPHIC SECURITY, EFFICIENCY METRICS, AND IMPLEMENTATION FEASIBILITY IN THE POST QUANTUM TRANSITION ERA

Kainat Mubarik, Malik Aazaz Abbasi

The imminent threat posed by the realization of large-scale, fault-tolerant quantum computers (QCs), capable of leveraging Shor's algorithm to break foundational classical public-key cryptosystems like RSA and ECC, necessitates an immediate and comprehensive shift to Post-Quantum Cryptography (PQC). This urgency is intensified by the "Harvest Now, Decrypt Later" (HNDL) threat, which compromises long-term data confidentiality. The NIST PQC Standardization process has established Lattice-Based Cryptography as the leading family for new standards. This paper presents a comprehensive comparative analysis of major PQC schemes built upon the foundational mathematical problem, Learning with Errors (LWE). We systematically evaluate these LWE-based schemes (CRYSTALS-Kyber, CRYSTALS-Dilithium) by balancing three critical dimensions: cryptographic security (against classical and quantum attacks), efficiency metrics (key size, signature size, and operational speed), and implementation feasibility across diverse hardware environments. Our findings provide essential insights and a structured framework to guide engineers, policy-makers, and organizations in making informed decisions for the strategic and secure migration to quantum-resistant standards in the post-quantum transition era.

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This article analyzes the threats to the security of modern cryptographic systems posed by the development of quantum computers, as well as the emergence of the concept of post-quantum cryptography as a solution to these problems. The study demonstrates that classical public-key cryptosystems, particularly RSA, DSA, and elliptic curve-based algorithms, can be broken using quantum algorithms. At the same time, new cryptographic systems based on hash functions, codes, lattices, and multivariate quadratic equations are considered a promising direction. The main challenges related to the efficiency, reliability, and applicability of post-quantum cryptography are also highlighted. As a result, the necessity of developing new cryptographic standards to ensure future information security is demonstrated.