Adobe Reader on Mac cannot use the CAC for signatures

macos

Symptoms

Adobe Reader is installed but signing options are greyed out on macOS 10.12+.

Likely cause

CryptoTokenKit framework support is turned off in Adobe Reader's signature preferences.

Fix

1. Open Adobe Reader > Adobe Reader (menu) > Preferences. 2. Categories > Signatures. 3. Under Creation and Appearance click More. 4. Tick 'CryptoTokenKit framework support'. 5. Optional: set 'Default Signing Format' to 'CAdES-Equivalent'. 6. If the option is missing, update Adobe Reader.

Sourced from militarycac.com. Rewritten for clarity.

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