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arXiv · 2608.13138

A Commitment-Based Hybrid Post-Quantum Cryptographic Model for Multi-File Cloud Storage

Lemdi Frank Prikutse·Regina Esi Turkson·Alimatu-Saadia Yussiff·Abdul-Lateef Yussiff·Maame G. Asante-Mensah
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Abstract

Cloud storage clients increasingly require authentication that remains secure against future quantum-capable adversaries, motivating hybrid constructions that combine classical primitives with standardized post-quantum alternatives. Extended naively to multi-file upload, such constructions incur a per-file lattice signing cost that dominates authentication time and becomes prohibitive at realistic batch sizes. This paper presents a commitment-based hybrid post-quantum model that addresses this bottleneck. It comprises AES-256-GCM bulk encryption, a hybrid X25519 with ML-KEM-768 key encapsulation mechanism, and a hybrid Ed25519 with ML-DSA-65 dual signature, computed over a SHA3-256 batch commitment. The commitment binds all ciphertexts in a batch to a single fixed-size digest that is signed once, reducing the number of post-quantum signature invocations per batch from n to one, independent of batch size; the remaining encryption and hashing is bounded by fast symmetric throughput. On a commodity client platform, averaged over 20 repetitions, this holds signing-phase time near-constant as the batch grows while the per-file baseline scales linearly. At n = 1000, the model reduces signing-phase time by factors of 629, 606, and 725 for 100 KB, 1 MB, and 10 MB files respectively, against a per-file dual-signing baseline sharing every other primitive.

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Lemdi Frank Prikutse, Regina Esi Turkson, Alimatu-Saadia Yussiff, Abdul-Lateef Yussiff, Maame G. Asante-Mensah. 2026-08-13. A Commitment-Based Hybrid Post-Quantum Cryptographic Model for Multi-File Cloud Storage. https://arxiv.org/abs/2608.13138

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