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-symfony-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 09:25:02 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 89c6f123cde62a28d419d57a7c1a3263a73a2c2d * md5sum cfcebc0e07982d5df1aca2881493fd54 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) iQEcBAABAgAGBQJSMtnmAAoJEIXCXpWhbrlNRwsIAJ3P1qsrty5HKzOdGhXIiRYF QksBVdjVi19NZ+BVed9hvsN2n63n+UTNihynWPEwQqKqzvkTGRfJCooWMgNvNnGi yxv9xHupSkX2A9/Nk/1XuO83OMYqWl6aSfWPHPb4DTauJ9jy5mMwM6DV33c+eCti qWAsF2rovHjoIumSRELa418WpfGgteseUEIb7Y8IY2zYZo81Pbfazj2DbtHtRvvR EfoJ2J3GpzuKtGvlg5Iv1acqnzJBpz10/ckXQXTvzE2e+eoH+yZV8SbzZ8dZ3GSF 9ECJ7+lKt6BXJQkQx8JN7mnIhn53v12kHuD9BGgrji/ACK/9Tedq2KLPPYnl31A= =KHyI -----END PGP SIGNATURE-----