Is there any reduction from Short Integer Solution to $\textrm{SIVP}_\gamma$ Short Integer Solution(SIS) is proved to be hard by reducing $\textrm{SIVP}_\gamma$ to SIS i.e., if we solve SIS, then we can solve $\textrm{SIVP}_\gamma$. Is ther any way to reduce an instance SIS to an instance of $\textrm{SIVP}_\gamma$?
If $A\in\mathbb{Z}_p^{n \times m}$, then you can define $$\mathcal{L}=\{y\in\mathbb{Z}^m~:~Ay=0\,\bmod\,p\}.$$

$\mathcal{L}$ is an $m$-dimensional lattice, and if you solve (search) $SIVP_\gamma$ in this lattice, it implies that you found a vector $v$ (actually many such vectors) such that $Av=0\bmod\,p$ and $||v||\leq \gamma\cdot\lambda_m(\mathcal{L}).$  So that's a solution to SIS.  When $m&gt;n$ (say $m&gt;2n$) and  $A$ is uniformly random, you can actually tightly bound the value $\lambda_m(\mathcal{L})$ to be around (ignoring some constants) $$\lambda_m(\mathcal{L})\approx \sqrt{m}\cdot \det(\mathcal{L})^{1/m}=\sqrt{m}\cdot p^{n/m}.$$
So, in short, if you can solve $SIVP_\gamma$ for random lattices of the above form, then you can find short vectors $v$ such that $Av=0\bmod\,p$ with $||v||&lt;\gamma\cdot\sqrt{m}\cdot p^{n/m}$.