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-sugarcrm-13.0rc2-wheezy-amd64.iso.sig gpg: Signature made Wed Aug 7 09:04:18 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 5562eb6b632bea46dac2260e6df4be543ad38d21 * md5sum e8a6f3218857c60aef7b79b3ff5ffc6b 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) iQEcBAABAgAGBQJSAg2IAAoJEIXCXpWhbrlN440IAMqiBGoOYYkW3cQF1Ny7FL4f CS7JS9Hnl2WLNXazDkrl6KmLG82MU1tTo6TZHqxKB+KhW7gcHPRNUE38RetKXUz4 da5J447Oynk0de6DDZFVlTHmRTe7APPoKjt6x8MDuB3zLxbihhQX3VUuFowWEY8X 5EoffM/GhJZfclau1BX0dNvq4be+Lno2hMFtkQLT6db+2dladaJwvdNj7LNJL8ww CjCWAS4tGlkSH+0DrrEJqQhTxHlMRBU8SgSz9OKPyiVHpe89FVFqGqz8i25iXfcY G9xqIsenzA9CMSBQMW4ZQq6G/APgg0j1wKMj0QtbsVhBY33mWSRC63x5dxds+4g= =p/Rh -----END PGP SIGNATURE-----