1

I'm new to cryptography and having a hard time understanding PRGs and PRFs.

Question: $G'(x)$ and $G''(x)$ are two different secure pseudorandom generators, and $G(x)=G'(x) \mathbin\Vert G''(x)$.

Is $G(x)$ still a secure

I thought $G(x)$ is secure at first, since $G'(x)$ and $G''(x)$ are secure, their outputs are uniform.

But I think it's not supposed to be correct later, since concatenation of them does not mean it's uniform.

M0S1AM
  • 11
  • 1

0 Answers0