A new signing key (for 2019 - 2020) replaces the recently expired 2017 - 2018 ISC codesigning key (codesign at isc.org) The new key, which has key ID 4CBB3D38, can be found via public keyservers or via the ISC website: https://www.isc.org/downloads/software-support-policy/openpgp-key/