Dowmload kali link:-
https://www.kali.org/get-kali/
$ gpg --keyserver hkp://keys.gnupg.net --recv-key 44C6513A8E4FB3D30875F758ED444FF07D8D0BF6
gpg: key ED444FF07D8D0BF6: public key "Kali Linux Repository <devel@kali.org>" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
$ apt install -y git live-build cdebootstrap
$ git clone https://gitlab.com/kalilinux/build-scripts/live-build-config.git
$ cd live-build-config/
$ ./build.sh --distribution kali-rolling --verbose
$ wget -q -O - https://archive.kali.org/archive-key.asc | gpg --import
$ shasum -a 256 kali-linux-2020.1-live-amd64.iso
$ gpg --fingerprint 44C6513A8E4FB3D30875F758ED444FF07D8D0BF6