hello, i've downloaded the Kali Linux 64 bit 1.1.0a from this url: https://www.kali.org/downloads/ by torrent.

you wrote there that i have to verify the downloaded file.
i have the gpg4win and the 2 files SHA1SUMS and SHA1SUMS.gpg
i also have the file that came inside the torrent kali-linux-1.1.0a-amd64.txt.sha1sum
they wrote to verify by writing grep kali-linux-1.1.0-amd64.iso kali-linux-1.1.0-amd64.txt.sha1sum | shasum -c
but where should i write it?

what is the easiest way to verify the key and the image?