How to verify downloaded file with .sig file?

Question

When I download GCC, it also has a .sig file, and I think it is provided to verify downloaded file. (I downloaded GCC from here).

But I can\'t figure out ho

Answer 1

according to this http://gcc.gnu.org/mirrors.html that should be Jakub Jelinek and valid. i don't know where you would get his public key though.