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-cakephp-13.0rc3-wheezy-amd64.iso.sig gpg: Signature made Fri Sep 13 07:36:28 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 7bfd7db1b9e8d7367e2d6194f8ce8421e0571f8a * md5sum 7e2afb8e03580312d568aa995fb75aff 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) iQEcBAABAgAGBQJSMsBzAAoJEIXCXpWhbrlNeksH/iKG+eNalRll6rGhqCp/98BG NfJcBWbNrcFCZVL51RYOTcMwlBwCKgV44Nj2Gqs6lQITjmq6/WZhB7JaCiEXEZGe 2nIzlRwhUGOM+I7BygMWQMPMQTy8UqQBM05JMelsAJf0IQ6SXyMhcO5MwVKA2GTt z8SBa+CQjBTTZbRNynTmybAJsXaAUCZl0OTbIo938g39iBRTz3fhXb28thPkL1C/ U+AIhTwr8Ox6J0o5ZFue4e7iLy/Ahxl0XNNjj+ocTSaSzMLEy0unN8rs7j6mMKz2 SlrLlO3NYn07tYGS8cMa5jmT8EzL2a51H3zs8eOR56J9YOn6/OF6MIqjkrsw/4M= =pFH6 -----END PGP SIGNATURE-----