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-projectpier-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 08:48:43 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum fe3f2bd738ebd7655b45635f77b58ecb57168233 * md5sum bfaf2574dd17af67c4af8f53972df961 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) iQEcBAABAgAGBQJSAgniAAoJEIXCXpWhbrlNrasH/3NcFOlMBbKSTXOJsVnzUWeV CRgF/LltMcaS3xizhcNVX18G0+G1hsCNXgoTbnpFbyVynA0odIxyQPPSYs9BZLtB CrdAE6VLa0Qju0aMpIaoqJqhXzi8TrJgO6Qq7zAYNsGygkM7gmGYR/ygX0aPjBtw r9TElM/uMm+Qwb2g1Mp8BYc2RWbg+oEYQJr5CHEfb+gm+TBIVdpxTIkPdIZxGHOT W98vuvVnWSPWgejl4sMvdXXSEX76RhCTNJVO5k3fAXTDEwgCvTqCNhgYbKBdLFr5 ajWrpQ9OXml4fo4XQsLmFlEAjeetrzr3+8m27IL5Iu5Pt0U0h2pD/k4r0Pnfai0= =zVe0 -----END PGP SIGNATURE-----