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Amit Sahai

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Preprint Sep 2026

Witness Encryption via Prime-Order Generic Groups

For every constant $c>0$, we unconditionally construct witness encryption for NP in the classical generic cyclic group model with the following properties. For SAT instances of size $n$, encryption runs in time poly$(n)$, and any satisfying assignment can be used to decrypt in poly$(n)$ time with correctness error $2^{...

I. M. Hair, Amit Sahai · 0 citations
Preprint Aug 2026

Polynomial-Factor Deterministic NP-Hardness for SVP in Every lp Norm with p>2

For every constant $2<p<\infty$ and every constant \[ 0<\varepsilon<\min\left\{\frac{p-2}{4p},\frac18\right\}, \] we show that the $\ell_p$-shortest vector problem for lattices of rank $M$ is NP hard to approximate within a factor of $M^\varepsilon$, via a deterministic reduction. For $p=\infty$, the same holds for eve...

I. M. Hair, Amit Sahai · 1 citation
Preprint Aug 2026

Refuting a Conjecture of Umans and Wang on Arithmetic-Progression Divisor Covers

An \emph{$n$-divisor set} is a finite set of positive integers containing a multiple of every integer from $1$ through $n$. Umans and Wang proposed, as the arithmetic-progression version of their Strong $(\alpha,\beta)$-Divisor Conjecture, an $n$-divisor arithmetic progression having at most $n^{2\beta}$ terms, each of...

Xin-hua He, Amit Sahai · 0 citations

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