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-icescrum-13.0-wheezy-amd64.iso.sig gpg: Signature made Wed Oct 16 07:23:41 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 0fc208bf6fc17fc08d9667b8d41d5382d68858e8 * md5sum c291b497c34907abe6394686b0347271 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 v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJSXj7tAAoJEIXCXpWhbrlNdvQIAKaLoy/Fgp+vNnfAMuvuWF8V uoclhufvBqbhsKme7FrtZEdB4w9buTYd+Tclu+ZoMAR+Y79PoumjdtIzM5fJQQCd 0m5G6SdGDJEz53l+sdZyHrI+H6omCwECTgrZucnJLwqTivXbc/2YFrfCc5nkhpoF aV5StZfEe7LFQmt2bv2VYVlhJwwa3ASlq/aiyI/1PSKt1j5F7URTEgdHRCT9crg5 /+t3YFbMhHggOK999k8EBN02zwKYzgwTurZGuLiFxH3+h20rRdYb1VjmNEmf8KLv e/nX5GoaXBEn5T08zybL1fsh3CNl96ZJZW1ZDfpkrpqr72cyO/baiJDSkPR5FqA= =xzPw -----END PGP SIGNATURE-----