A second notebook whose pages are encrypted with a key made from a passphrase plus the server key. It is unlocked into memory only (15 minutes idle, Lock, or sign-out), is not in search, lists or downloads of the ordinary notebook, and limits wrong guesses.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Pages are sealed with AES-256-GCM. Each person's key is derived (HKDF) from a master key in the settings file plus their Authentik issuer and subject. Plain files from earlier versions are read and re-saved encrypted. Mako refuses to open a notebook it cannot decrypt rather than overwrite it.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>