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-web2py-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 09:45:41 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 38d67924306d38efe530e62f90fb64f309c409ac * md5sum 6c3460e534e2d5a3e2f206479a77b907 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) iQEcBAABAgAGBQJSMt69AAoJEIXCXpWhbrlNChYIAIXuEf2YxMDaB3Rs0pCimwCO loO2774mchUbJvsIJirAy6WA4XoRLDzODv0t13NcBfUgzlIHklcJPMKg7ZF8PCx0 VtZwVUNV2mFa2jWMNC+ExzDSYt6qFe/OS1lDnJ6tQ7ulkFMX0IJntX8wt7TXF91G yF71aHxVrpzDL3INFEI/2NxrVnkpmmyo3cK5WqI92fiiPXxCoFqjUJDq8M347FdO +AD6sjFPWLP+5fyeqjLNRB43ZrL+QX5iq2vk8M1ulJPD6p54UwLvprPfYeonpeQ5 e5NSpx/f+GPOHMUQQQ/iRTBl2rbSiUG8e/QNVeQ+VFYhFDUyVxwxnt6kV7tuy6w= =nbRj -----END PGP SIGNATURE-----