Redefining GCM’s resistance to cryptanalysis with offset mechanisms
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Abstract
The research paper proposes an enhancement to the Galois/Counter Mode (GCM) of authenticated encryption by introducing an “offset” mechanism. This modification aims to improve privacy and resist differential cryptanalysis without significantly impacting the mode’s efficiency and simplicity. The improved GCM maintains its original features, such as minimal block cipher invocations, the use of a single cryptographic key, and efficient offset computation. It provides a detailed analysis of the operational framework, including the integration and calculation of offsets in encryption and decryption processes. By complicating the predictability of differential cryptanalysis through unique offsets, the paper asserts this enhancement significantly increases GCM’s security within a concrete security model. The discussion emphasizes the benefits of the offset-enhanced GCM over other modes, highlighting its suitability for high-speed, parallelizable cryptographic applications while bolstering resistance against cryptanalytic attacks.
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