# Encryption

```
  - High Level overview of the message encryption process
    - SED vs. SEIPD (v1) vs. SEIPD w/ AEAD (v2)
  - Encrypt for multiple/single subkey per certificate?
  - "Negotiating" algorithms based on recipients preference subpackets
    - Prevent "downgrade" -> Policy
  - Implications of how a recipient cert is "addressed" (fingerprint/key-ID vs. user-ID) (preferences, expiration, revocation)
```