gpg -a -b centos-6-x86-20170709.tar.xz
gpg -a -b centos-6-x86_64-20170709.tar.xz
gpg -a -b centos-6-x86_64-minimal-20170709.tar.xz
gpg -a -b centos-6-x86-minimal-20170709.tar.xz
gpg -a -b centos-7-x86_64-20170709.tar.xz
gpg -a -b centos-7-x86_64-minimal-20170709.tar.xz
gpg -a -b fedora-24-x86_64-20170709.tar.xz
gpg -a -b fedora-25-x86_64-20170709.tar.xz
gpg -a -b fedora-26-x86_64-20170709.tar.xz
gpg -a -b oracle-6-x86-20170709.tar.xz
gpg -a -b oracle-6-x86_64-20170709.tar.xz
gpg -a -b oracle-6-x86_64-minimal-20170709.tar.xz
gpg -a -b oracle-6-x86-minimal-20170709.tar.xz
gpg -a -b oracle-7-x86_64-20170709.tar.xz
gpg -a -b oracle-7-x86_64-minimal-20170709.tar.xz
gpg -a -b scientific-6-x86-20170709.tar.xz
gpg -a -b scientific-6-x86_64-20170709.tar.xz
gpg -a -b scientific-6-x86_64-minimal-20170709.tar.xz
gpg -a -b scientific-6-x86-minimal-20170709.tar.xz
gpg -a -b scientific-7-x86_64-20170709.tar.xz
gpg -a -b scientific-7-x86_64-minimal-20170709.tar.xz