Secure Quantum-Enhanced Cryptographic Architecture using Optimized Tabula Recta for Cipher Text Hardening
Secure Quantum-Enhanced Cryptographic Architecture using Optimized Tabula Recta for Cipher Text Hardening |
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| © 2025 by IJETT Journal | ||
| Volume-73 Issue-9 |
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| Year of Publication : 2025 | ||
| Author : Syed Usman Basha, S. Brintha Rajakumari | ||
| DOI : 10.14445/22315381/IJETT-V73I9P128 | ||
How to Cite?
Syed Usman Basha, S. Brintha Rajakumari,"Secure Quantum-Enhanced Cryptographic Architecture using Optimized Tabula Recta for Cipher Text Hardening", International Journal of Engineering Trends and Technology, vol. 73, no. 9, pp.328-341, 2025. Crossref, https://doi.org/10.14445/22315381/IJETT-V73I9P128
Abstract
In the era of quantum computing, existing cryptographic systems are increasingly vulnerable to quantum-based attacks, necessitating the development of robust encryption architectures. This research proposes a secure quantum-enhanced cryptographic architecture using optimized tabula recta for cipher text hardening, fuses classical polyalphabetic substitution with quantum randomness to reinforce data confidentiality. The key issue addressed is the susceptibility of legacy encryption schemes, particularly those based on deterministic keys, to quantum algorithms such as Shor’s and Grover’s, which can compromise data integrity and confidentiality in seconds. To resolve this, introduce a hybrid encryption framework that optimizes the classical Tabula Recta Cipher (TRC) using quantum-generated keys to dynamically alter substitution patterns, thereby achieving non-repetitive and high-entropy ciphertext structures. The methodology incorporates a Quantum Random Number Generator (QRNG) to produce non-deterministic seed values, enhancing unpredictability, while an optimized Tabula Recta grid enables efficient yet secure symbol substitution. The primary objective is to provide a lightweight, scalable, and quantum-resilient encryption mechanism suitable for secure communications across cloud, IoT, and edge platforms. Experimental evaluations demonstrate significant improvements in entropy, diffusion, and resistance to brute-force and frequency analysis attacks compared to existing schemes. The results confirm that the proposed architecture offers a viable post-quantum cryptographic solution with enhanced ciphertext complexity and minimal computational overhead.
Keywords
Quantum Cryptography, Tabula Recta, Ciphertext Hardening, Post-Quantum Security, Quantum Random Number Generator (QRNG), Hybrid Encryption, Polyalphabetic Cipher, Data Confidentiality, Cryptographic Entropy, Secure Communication.
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