Welcome to the resource topic for 2025/962
Title:
An almost key-homomorphic post-quantum block cipher with key rotation and security update for long-term secret storage
Authors: Thomas Prévost, Bruno Martin, Olivier Alibart
Abstract:In this paper, we propose a new block cipher primitive, based on ring-LWE, which allows key rotation with a possible security update. This makes it possible to double the security of the ciphertext with each key rotation. Our scheme could therefore be used for long-term secret storage, allowing the security of the ciphertext to be adapted to the attacker’s computing power, without the need for decryption.
We propose an implementation of our cryptographic scheme and prove its security.
ePrint: https://eprint.iacr.org/2025/962
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