-----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-vtiger-14.1-jessie-amd64.iso.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-vtiger-14.1-jessie-amd64.iso bf6a2a58eadc0a93fcbcaac35f77a62d $ sha1sum turnkey-vtiger-14.1-jessie-amd64.iso 559b8442d4a4f146a71681b2e66bbfd0f06fc3f6 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkP1AAoJEIXCXpWhbrlNXwUH/iYUDT2af61aZ0itnaZ5s4Zs xUeSDBWrJpf9t65BNT5lR9dklc65gqfC4YNZk0lIdFa1NbZ2lPNXWR5WQiUn0xQy 4w5xsDVD3TW3WmXJ/mHTjoeSC/0vVxJTyGljhkKsZDFTWQnEUOnCcQZ41Bz/Xehk ULGnyfd1jV6MMH7N3OgP3GEfwpEsROwUbVYg+CLcbA1D+5yrjZ9PFc6AwdWR3nwL DyDHA/sWs3M45uSy1oz93onrVU8xfQwnLkyVseygetz+srL0Sb9N3VFgb7NXrQnw HvJYEpWJxNpq/J0BA74CP1UMW4YWwfsM4OrRW9ku/N7tpT+U9/RKMlf5I0c/0TQ= =lhvV -----END PGP SIGNATURE-----