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-tomatocart-13.0-wheezy-amd64.iso.sig gpg: Signature made Tue Oct 15 16:55:19 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum f560a44def8b1359b0d2b9b0f36ef4d4d1746735 * md5sum 6f37f1ee5b76dbf603a5005fa024547f 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) iQEcBAABAgAGBQJSXXNtAAoJEIXCXpWhbrlN6iUIAKhiDAFlUrxrW13wm41ACNtd WWKnRu91lmnHY/Msb6KDT2DPk0D0jc/EG2XxlE2WIHGU7x2THNv7TAZN9MGjyoyI JRob+ISBzg2Q6RnEPGL4KAdB6LrTdJXG8Wol7KiVVp+YMBQeO2fHRn266NjcCe/o F7QdLQGXoBkruuWQT5oFpTyqR9kIGwdvqWvGWgGY8ijP77Ioo7MT3PyC9f+C/P3K OTZ6RtGz8UDSFsRAJupU97LwrzS6W5r5U5s7sot75jZn3PfpfLlWyukDVnhD/rmm sCmDcofSaViRNHmMJYuB5TEYWI+sUl2wpFBCaGMMVSUwlnpSZbbyOx6Nsy9TqZ0= =3kiP -----END PGP SIGNATURE-----