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 debian-7-turnkey-phpbb_13.0-1_amd64.ova.sig gpg: Signature made Wed Oct 16 09:40:15 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum ae8862f61d014c48af8893d13f979c6f4392cc18 * md5sum dbb77f5d9905eff111d0852ee03649f9 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) iQEcBAABAgAGBQJSXl74AAoJEIXCXpWhbrlNK0wIAJi6sVPXM1nr743qwo0F1L1w eF6zqgt76WTyD9jkBFbZnS3oiPV7BxAUQ5ymFOvi+Ro5pTsKh9HQ0HISxIqCZh2r FI5tWmWnLBgQKtP2FJW/kF5Pi2Vk/vei1WsZ2aqWAQpIC8EoDKQBp1cSNdQt4NS7 OUYPqz3xMBUtaMriszM2jNQEx0Tsv3ZD7CXy5SsHZ3nYc0ZAYcJZ6hUyA32Ips3x tM3ti3lRQB6dmVd+b0qjQJGMfC0ANqNSwcW7mnQBTqGlo40z34nxEOtENZQk9wjN 39qBeAU7eg/oGyy9RDelea1hxbGxuuGwt7sdO12YSDFbq3GMj3BdNoL2Is5Mdag= =P+GF -----END PGP SIGNATURE-----