-----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-14.0-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-14.0-jessie-amd64.iso aa02530d15526edf30cdf36979c8d423 $ sha1sum turnkey-postgresql-14.0-jessie-amd64.iso 717130bb7407865a529eace730ee2db80cfd0aec -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJWL0DfAAoJEIXCXpWhbrlNeXgH/iPm8NtnpImsEL9Bzq0iITsp TRKULXw0AmO2PMlowoDS1IcjEW2qfcRPzcHCEjPK6yilsTHvZrFcE1ZNAIbtuJfa Zlf8WBQKbR/5r0FvsVT9ZUtzycz/0XGzg4enFz6vbf5z8RHqR0h9ymWs5O2A4Qbe NYiMrK7yJnltkIOCGjdbGr0r4dhNa2QsA05SSuOBpy2hSm5oOG+bwUNavpNtfvaW 0rNnm541AvFA/sTa6EhLrpGlXgbtoQ6F9sX6FmUXvt3BPapoLF0EtfFsZTXH+gXK iC7gKTYmYuKofR84oee9OmkZS61pHGjg6YWhPX5VQ2Gmm9wztLjItPe5th0R9DE= =h44K -----END PGP SIGNATURE-----