Let $R:\mathbb{F}^n \rightarrow \mathbb{F}^m$ be a multivariate quadratic map. Here $\mathbb{F}$ denotes the finite field of order $q$.
I am curious to know whether the distribution of $R(x)$ for uniform $x\in \mathbb{F}^n$ is computationally indistinguishable from uniform.
I was reading a paper and authors assumed this fact. I am attaching the screenshot for your kind reference. Refer to Theorem 2.
Link to the paper https://eprint.iacr.org/2017/131.pdf