I-D Action: draft-sullivan-mls-attachments-01.txt

Internet-Draft draft-sullivan-mls-attachments-01.txt is now available.

   Title:   Encrypted Attachments for MLS
   Authors: Nick Sullivan
            Raphael Robert
   Name:    draft-sullivan-mls-attachments-01.txt
   Pages:   15
   Dates:   2026-07-21

Abstract:

   This document defines random-access authenticated encryption of large
   write-once files for Messaging Layer Security (MLS) groups.  A file
   is encrypted so that a receiver can decrypt and authenticate any byte
   range without processing the whole file.  The encryption is SEAL-
   attachment, SEAL's named write-once attachment scheme (raAE),
   parameterized by the AEAD and key derivation function of the group's
   MLS cipher suite and keyed from the MLS exporter.  The encrypted
   bytes are carried by any means, and a recipient needs only a small
   reference (the object's identifier, length, and snapshot value, and
   an optional locator) to fetch, key, and verify the object.  Carrying
   that reference in an MLS message attributes the object to the member
   that sent the message.  MLS application messages cannot carry large
   files, and existing attachment encryption produces an opaque,
   immutable blob with no partial access.  This extension supplies the
   random-access layer those uses need.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-sullivan-mls-attachments/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-sullivan-mls-attachments-01.html

A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-sullivan-mls-attachments-01

Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts


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