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-mongodb-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 08:34:48 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 19389e609dd98c5487840dcd0b25b1501e5a2e95 * md5sum 57722c0ebcd3ace73e2fc365e602c254 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) iQEcBAABAgAGBQJSMs4fAAoJEIXCXpWhbrlNUzYH/1XqUPql2IH/KFBIADlQzbUu up3CHc17hReBiOeDGGVlgGRmjk8hVV25bW55/Kt7paeYS8HOtYdAJEn9LOc4ZDZb qGZk3om/SA4zrCE5TZyQTCE9rTqFtEGs94pv+u/23WCnLc7MnKhsgp9YHVbvi0Pq YiOqZ//91NNqUfIm0jaH5vRS4tLetDYm0zVtoGWqif5KluJxOJAUio/42zaFk7VQ dKRBC8Sr9/SxpGyfHI42lOKMBHQMIzsl5iRFFwmA51mVlYQ3ZWEBHjIzqTl5p+OX 3MhroR58A2TFvbjwZazCc9lAmSBf2zyjKdI7OVFXW0rH52vYep5knaeZO6SEX9Y= =E7Oo -----END PGP SIGNATURE-----