Yubikey on Problem of Network https://www.problemofnetwork.com/tags/yubikey/ Recent content in Yubikey on Problem of Network Hugo en-gb Wed, 29 Jul 2026 00:00:00 +0000 How Yubikey resident certs can break Yubi resident GPG on macOS https://www.problemofnetwork.com/posts/how-yubikey-certs-can-break-gpg-on-macos/ Wed, 29 Jul 2026 00:00:00 +0000 https://www.problemofnetwork.com/posts/how-yubikey-certs-can-break-gpg-on-macos/ gpg –card-status started failing with ‘Operation not supported by device’ after a macOS upgrade. The cause wasn’t the upgrade — it was the OpenSC CryptoTokenKit extension quietly claiming the reader.