Emergent Mind

Linear complexity of Legendre-polynomial quotients

(1705.01380)
Published May 3, 2017 in cs.CR and math.NT

Abstract

We continue to investigate binary sequence $(fu)$ over ${0,1}$ defined by $(-1){fu}=\left(\frac{(uw-u{wp})/p}{p}\right)$ for integers $u\ge 0$, where $\left(\frac{\cdot}{p}\right)$ is the Legendre symbol and we restrict $\left(\frac{0}{p}\right)=1$. In an earlier work, the linear complexity of $(fu)$ was determined for $w=p-1$ under the assumption of $2{p-1}\not\equiv 1 \pmod {p2}$. In this work, we give possible values on the linear complexity of $(fu)$ for all $1\le w<p-1$ under the same conditions. We also state that the case of larger $w(\geq p)$ can be reduced to that of $0\leq w\leq p-1$.

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