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-plone-13.0-wheezy-i386.iso.sig gpg: Signature made Mon Oct 14 19:04:11 UTC 2013 using RSA key ID A16EB94D gpg: Good signature from "Turnkey Linux Release Key" For your convenience we also include file checksums: * sha1sum 17aa4edb3d8fb012b3217ba5ddc18c4dab178219 * md5sum 6e9efbeba543fb290228d7a862d7d7bb 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) iQEcBAABAgAGBQJSXEAcAAoJEIXCXpWhbrlNfIUH/1FKJkIADjKkVHhE1jJ0Lpwu s0By1Olid68PSR3XzoYeg282dNRr2ob77N63S6WBqUpuc9BONguYelgaj9Ce1kM0 Y46asZ83O1cxmLNIbQTu5PNlEnJysIYNcI2jRr9uJi5g5Hal4xM4ZDyKXdDOCrNF zCXUl9yi7DZpMATlqBlnsKppqunVIB+knPDB+uoNzSS4PJVPRT27njj7MgI5o4Dg dp24QOsW7XeF/7SkwNsv9ROiln6lmUnHjMZOo2vmfGd4TqOWhFMR5nz06XfVallP i8Gz8sB80uZSHZ4pXyVBLOkfEndV60JACQAyDRv/0fXp0I6xI1BX9mY28eN0l/w= =NX+5 -----END PGP SIGNATURE-----