This signature file may be used to cryptographically verify file integrity, like this:: $ gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0xA16EB94D $ gpg --list-keys 0xA16EB94D pub 2048R/A16EB94D 2008-08-15 [expires: 2023-08-12] uid Turnkey Linux Release Key $ gpg --verify turnkey-gitlab-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 13:10:02 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum facf6eaec09f2d2c304ecb0914030aa88358566a * md5sum dafeaa3fbfab26a18254614d92821261 You can calculate these on your end and compare to check for errors, but cryptographic verification is recommended for security reasons. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJRgRQbAAoJEIXCXpWhbrlNEiEIAN+04HHZRNnRAf5HSSRbWQAX O+F3kqaIZnXFGwF/ydBWY2a17kjUcycL1gUrnoTl3E476Qo3NSh6wByyqCUyEQ7l gfCn8r+r0a3v6I0XQcwX1FHkMCTkEETkF0P+n5vmitEQunuYobV7GssMbl9339DR k/rJfXE2jZeoJwL/2wbHBziICKIJ6VcXC2ch+CQxiBKabEXMsSyH7KbzmFtp/VIN CJjAnXtz2oBF6s3+VDTU/ajYxaJY6VQo0aWATrb74q7LRKij1nFnEfLIBcesCCq9 /syEv36mo/deQQMsXEmBT+4XoD3SMrOYdXVVv/GVQ6JdlBhlF1pripXOd0ALckk= =OWDK -----END PGP SIGNATURE-----