- Post-Quantum Cryptography
       https://datatracker.ietf.org/doc/draft-ietf-openpgp-pqc/
   - Key Replacement
       https://datatracker.ietf.org/doc/draft-ietf-openpgp-replacementkey/
   - Persistent Symmetric Keys
       https://datatracker.ietf.org/doc/draft-ietf-openpgp-persistent-symmetric-keys/

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