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-moodle-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 08:20:47 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum c88004979de3febfd6b7e82a53a67b16fa2f7860 * md5sum 0ba79fa4e3a2764091e220b63eee353b 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) iQEcBAABAgAGBQJSAgNUAAoJEIXCXpWhbrlNh1IH/idPVXY16LrKXU8RMsuUpKum 6sbdGJIVAQqAehw4ozezFQ57XihFyQjXOmt+1xyOun2KPQZEClaPZJpQX7Fjpiup s+9NTMYgldpw5jV6HV6OO/6F65S7grLZEbXahKLoj6BxHU1mGvFInq3N3wX+pMIx sEE9vgFTI/f3BdyXnFw+tyRavQ9m2Ezs+kHc0ig0FzSyc9QDVEQuuybJXm5dnN8C LtjEgBtieu9J+bCFE1jOF2brUD0WfkYVq8aE9uiYdbqOp4960MrciDtthdtF9moF GYYeLSUmO98Lv/Gjq6bHbUKIiChTWd5zcOvzAWfP0GKIv/2b8VLFp4eJxOPaZ5M= =4WEG -----END PGP SIGNATURE-----