Finer-Grained Fixed-Key Differential Probability Distributions via Quasidifferential Decoupling

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The recent study of fixed-key differential probabilities mainly follows two complementary approaches. The first derives key-dependent constraints from the internal structure of the primitive. This approach is intuitive, but a complete theory is difficult to build. The second approach is based on quasidifferentials. It is complete in theory when all quasidifferentials are considered, but exhaustive enumeration is usually infeasible in practice. In this paper, we relate quasidifferentials to concr