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-12.1-squeeze-amd64.iso.sig gpg: Signature made Wed May 1 13:33:45 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 74dfb95fd1d033a0cb1b3be00128a372a5f5a957 * md5sum 9992f4b9f523c9de4de3f0f9f8a7bc9d 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 v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJRgRmwAAoJEIXCXpWhbrlNq58IAI6QiRUZ1lrIgAU7IpvA0WeS 5gOOh2dxn+VQN6JypF3SdjEP/OVo4n7sqfLVKBdaIC7HejX3+lR6elP11rVBgKWM GKwHQG9NfJtCD+cpITbZdnK8QH/5j4P0StRw++QotTk3tx/Xqp0GrLToVnyyn96A vfFdQ0RA+iiQ6KxgRtb1Lq0m4je6W4LYLEr0FN8iK7v0UXY9Lfm5hPeetVi8Ayd5 EfIDbGJELbw0N+ebAD49ZZ2JGGnZAMJl+OnAfF7ekZUILyPBvhGlnc37Q4Ov+Jg2 iHhC2HbxeRUH53Jo1aRj1ZAhNcgqa8kyEcPs516tASlS+1/ft1ZxVbJe1upPeC8= =z+dN -----END PGP SIGNATURE-----