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-tomcat-13.0-wheezy-i386.iso.sig gpg: Signature made Mon Oct 14 19:20:12 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum c9ef1c3cad9714fd57f3179bc3b96a546d2e5a7b * md5sum e344f8f5eda2f23b8a3499a4ae9fd94a 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) iQEcBAABAgAGBQJSXEPeAAoJEIXCXpWhbrlNS9cH/2nxeqhIdxItepsqZibhT/pv Ohi4U8hlLlus3OBGboYgL+9/i0DGXjLoSuJVE0gQpf0Hn3EEePNwvHjgq0Cosi4q vrDm1uAPd2zQbTdQYVe5KTHeJep937slCG8Nij+WRfXRHfiz8Wjvdo9ShO6ZVBD+ GRoOyVtTI0cP2o9X2LVH9ZieTF2IO5dBD0Beyjm1P7DGMPVNmbk7hHXFXT3lAUTb Pe2OjR6GuePSxP8zkPdPkq+UMV0iE5RepgAMCVR7r5iS6d9kEIgrkvBerSON4uMW FnDOpjrQsnUf2HkqFt8HIl3A0gJC/kcOKlaW3AxUVw46e8fimAkCJwb7fCbvIQ8= =S3Cj -----END PGP SIGNATURE-----