I've just downloaded a FreeBSD 11.0 iso file from the FreeBSD website. I've also obtained the signed SHA512 and SHA256 checksum files. The website says that the checksum files are PGP-signed. How do I verify the integrity of the downloaded iso? Where do I get the public key to verify the signature in the checksum files?
If you are in a Linux / Unix-like system,
sha256sum /path/to/freebsd.iso sha512sum /path/to/freebsd.iso
will print the checksums.
The public PGP key is likely one of these.