Welcome to the resource topic for 2025/742
Title:
Seamless Post-Quantum Transition: Agile and Efficient Encryption for Data-at-Rest
Authors: Stephan Krenn, Thomas Lorünser, Sebastian Ramacher, Federico Valbusa
Abstract:As quantum computing matures, its impact on traditional cryptographic protocols becomes increasingly critical, especially for data-at-rest scenarios where large data sets remain encrypted for extended periods of time.
This paper addresses the pressing need to transition away from pre-quantum algorithms by presenting an agile cryptosystem that securely and efficiently supports post-quantum Key Encapsulation Mechanisms (KEMs).
The proposed solution is based on combining a CCA-secure KEM with a robust Authenticated Encryption scheme, allowing only the dynamic component - the symmetric key encapsulation - to be updated when migrating to new cryptographic algorithms.
This approach eliminates the need to re-encrypt potentially massive data payloads, resulting in significant savings in computational overhead and bandwidth.
We formalize the concept of cryptoagility through an agile-CCA security model, which requires that neither the original ciphertext nor any updated version reveals meaningful information to an attacker.
A game-based proof shows that the overall construction remains agile-CCA secure if the underlying KEM and AE are individually CCA secure under a random oracle assumption.
The result is a future-proof scheme that eases the transition to post-quantum standards, enabling enterprises and cloud storage providers to protect large amounts of data with minimal disruption while proactively mitigating emerging quantum threats.
ePrint: https://eprint.iacr.org/2025/742
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