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-rw-r--r--doc/book/cookbook/encryption.md5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/book/cookbook/encryption.md b/doc/book/cookbook/encryption.md
index 8d45a0ee..09438549 100644
--- a/doc/book/cookbook/encryption.md
+++ b/doc/book/cookbook/encryption.md
@@ -104,5 +104,8 @@ Implementations are very specific to the various applications. Examples:
in Matrix are probably encrypted using symmetric encryption, with a key that is
distributed in the end-to-end encrypted message that contains the link to the object.
-- Aerogramme: use the user's password as a key to decrypt data in the user's bucket
+- XMPP: clients normally support either OMEMO / OpenPGP for the E2EE of user
+ messages. Media files are encrypted per
+ [XEP-0454](https://xmpp.org/extensions/xep-0454.html).
+- Aerogramme: use the user's password as a key to decrypt data in the user's bucket