-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Two steps are required to cryptographically verify image integrity. 1. By verifying the integrity of this signature file, you can be sure that the checksums included in this file are valid. $ gpg --keyserver hkp://pool.sks-keyservers.net --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-simpleinvoices-14.1-jessie-amd64-xen.tar.bz2.sig gpg: Good signature from "Turnkey Linux Release Key" 2. By calculating the image checksum and validating the hashed value is the same as listed below, you can be sure the image was not corrupted in transit or tampered with. $ md5sum turnkey-simpleinvoices-14.1-jessie-amd64-xen.tar.bz2 509e50fa626078cc8755c1e433bd20e5 $ sha1sum turnkey-simpleinvoices-14.1-jessie-amd64-xen.tar.bz2 ce9267f916ef8083a3fac2cba5d805d74a5e9a98 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXDJn6AAoJEIXCXpWhbrlNv8gIAJGzZncZU6Mj2Xcb/xZ/1mXa ori46VujvpHAHXJaM++PWXoNtmS/SltgSIR4lwsrv5o7dBYbvI7M6iUB5VoRbOiY MIwqKXWTq11y22MyFS87ItUc1MdE1cUFQYXHLL34BPkIXYM0Obu6tT4IRv44VyaG z7endCdtscQv1OMaI7Ht3trrC1na0I1V9E1HKqCUNGjGrvftI7zooRpFmVd2+/+v L+71w+vO4TTJAJPaBThCFg963m1yrFcibKLJpySDpm+nK56VgGMx7oyHK2UE2+t8 7Zx8BFcj1k/CzWf9ZEVqDtpkGoc+C5fm0/ugv3n4wcE65ArQzyGljrCDUflth34= =ndGk -----END PGP SIGNATURE-----