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Add diagram for SEIPDv1

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Paul Schaub 2023-11-27 23:22:52 +01:00 • committed by Heiko Schaefer
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book/source/10-encryption.md
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@ -84,6 +84,13 @@ Version 1 SEIPD can only be combined with either [version 3 PKESK](https://www.i
When communicating with a mix of recipients, some of whose OpenPGP software only supports OpenPGP version 4, then this mechanism must be used.
```{figure} drawio/SEIPDv1-PKESK.png
:name: fig-encryption-seipdv1-pkesk
:alt: Depicts a dotted hexagon labeled "Plaintext", from which a curved arrow passes another dotted hexagon "Session Key" and finally points to a "SEIPDv1" packet. Two more curved arrows originate from the session key and pass Alice' and Bob's encryption key, ending in two PKESK packets.
With SEIPDv1, the session-key is directly used as message-key to encrypt the payload
```
## Handling encrypted session keys: PKESK, SKESK
"*ESK" is a family of mechanisms for dealing with symmetric key material. It has two branches: