-----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-postgresql-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-postgresql-14.1-jessie-amd64.iso 1c00beb411fa0434866b730ebcd06bc0 $ sha1sum turnkey-postgresql-14.1-jessie-amd64.iso daa8b38e1cbe19193a00aaf1268a7587338ef32a -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJXCkPzAAoJEIXCXpWhbrlN5hAIAMYdOdCETxesFHapCSZbljdU L1Rvc/aUotgYEei6K8BScM39jbUitNP/4FyRli9XiPzyz1Vuoz7mJ90i/Xke9yxp 9PIzAvU+d6asOfV3MpjnVwneUBuB0LhfNZOWhrgYnptSQ1PkJMHgvYKcPyMJOGKN 9yw5nzqPphF6IohR0VHAzHtlgbCBl/RqD9OWvTvBxmeHHbbu0Lg7ph57meZArl40 LQkieo9sKEYPnQixM4aokJni+aNE5egmEtvoJ4psqwyDgrYxnWwsUIvFrHG1kgw1 p+CerWIm026vW4vgYLewpa4NwKUiRssEoGEF3LY0ZtOHlI6KazzTjQKMR9GEEBo= =YXmJ -----END PGP SIGNATURE-----