Brakedown's expander code

ePrint Report: Brakedown's expander code

Ulrich Haböck

This write-up summarizes the sampling analysis of the expander code from Brakedown [GLSTW21]. We elaborate their convexity argument for general linear expansion bounds, and we combine their approach with the one from Spielman [Sp96] to achieve asymptotic linear-time under constant field size. Choosing tighter expansion bounds we obtain more efficient parameters than [GLSTW21] for their 128 bit large field, reducing the encoding costs by 25% and beyond, and we provide a similar parameter …

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