ch10: link to zooming in

book/source/10-encryption.md

@@ -8,6 +8,8 @@ SPDX-License-Identifier: CC-BY-SA-4.0
 
 [Encryption](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#section-2.1) is one of the core facilities of OpenPGP. It provides confidentiality.
 
+For an in-depth, packet-level view of encrypted data in OpenPGP, see our chapter {ref}`zoom_enc`.
+
 ## High-Level overview of the message encryption process
 
 Encryption in OpenPGP is performed in two distinct steps:
@@ -17,7 +19,6 @@ Encryption in OpenPGP is performed in two distinct steps:
    - Usually, the information that allows retrieval of the message key is encrypted to a public encryption component key of the recipient.
    - Alternatively - or additionally - the secret symmetric key may also be encrypted using a passphrase. This is a specialized and less commonly used mode of operation that doesn't require OpenPGP certificates.
 
-
 ```{admonition} TODO
 :class: warning
 
@@ -79,6 +80,8 @@ When communicating with a mix of recipients, some of whose OpenPGP software only
 
 ### SKESK: Session key encrypted to a passphrase
 
+Also see https://flowcrypt.com/docs/guide/send-and-receive/send-password-protected-emails.html
+
 ## Advanced topics
 
 ### Encrypt to multiple/single subkey per certificate?
@@ -96,11 +99,3 @@ When communicating with a mix of recipients, some of whose OpenPGP software only
 
 Produce text around discussion: https://mailarchive.ietf.org/arch/msg/openpgp/ZTYD5VJsG1k2jJBbn5zIAf5o7d4/
 ```
-
-## Zooming in: Packet structure
-
-### Encryption yields a 'wrapped' openpgp packet stream
-
-### SKESK
-
-Also see https://flowcrypt.com/docs/guide/send-and-receive/send-password-protected-emails.html

book/source/21-zoom_encyption.md

@@ -3,6 +3,7 @@ SPDX-FileCopyrightText: 2023 The "Notes on OpenPGP" project
 SPDX-License-Identifier: CC-BY-SA-4.0
 -->
 
+(zoom_enc)=
 # Zooming in: Packet structure of encrypted data
 
 ## SEIPD v2