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Azuma-Hoeffding Inequality

Concept

A concentration inequality for martingales with bounded differences. In the FuSS framework, it is applied to a Doob martingale sequence derived from fuzzing iterations to bound the probability that the total number of successful discoveries deviates below its expected value, yielding a theoretical iteration lower bound.

First seen 6/20/2026
Last seen 6/20/2026
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Azuma-Hoeffding Inequality

The Azuma-Hoeffding inequality is a concentration-of-measure result that provides a tail bound on the deviation of a martingale from its expected value when the martingale has bounded successive differences. It generalizes the classical Hoeffding bound to the martingale setting.

Application in the FuSS Framework

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The paper uses the Azuma-Hoeffding inequality in its theoretical analysis.

CITATIONS

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[1] The Azuma-Hoeffding inequality is applied to a Doob martingale sequence with bounded differences |M_t - M_{t-1}| ≤ 1 to obtain a tail bound on successful fuzzing discoveries. FuSS: Coverage-Directed Hardware Fuzzing with Selective Symbolic Execution
[2] Applying the Azuma-Hoeffding inequality yields Pr[X ≤ (1−δ)E[X]] ≤ exp(−δ² E[X]² / (2T)). FuSS: Coverage-Directed Hardware Fuzzing with Selective Symbolic Execution
[3] Substituting E[X] = T·P_i and solving for T gives the iteration lower bound T ≥ (δ / (2 P_i²)) · 2 ln(1/ε). FuSS: Coverage-Directed Hardware Fuzzing with Selective Symbolic Execution
[4] Because P_{f+s} > P_{f+p} > P_f, the required number of iterations T decreases as per-iteration success probability increases, theoretically justifying selective symbolic execution. FuSS: Coverage-Directed Hardware Fuzzing with Selective Symbolic Execution
[5] The Azuma-Hoeffding inequality is referenced as citation [7] in the FuSS paper. FuSS: Coverage-Directed Hardware Fuzzing with Selective Symbolic Execution