I-D Action: draft-liu-iotops-modbus-seriallink-sec-spec-07.txt

Internet-Draft draft-liu-iotops-modbus-seriallink-sec-spec-07.txt is now
available.

   Title:   Modbus Serial Link Communication Security Protocol Reference Specification and implementation guide
   Authors: Penghui Liu
            Rongwei Yang
            Meiling Chen
            Yu Fu
            Weizhe Zhang
   Name:    draft-liu-iotops-modbus-seriallink-sec-spec-07.txt
   Pages:   5
   Dates:   2026-08-13

Abstract:

   The Modbus TCP protocol has adopted TLS-based security standards;
   however, Modbus serial communication over EIA/TIA-485 multi-point
   systems, commonly used in 2-wire or 4-wire configurations, lacks
   standardized security mechanisms.  These systems support cable
   lengths exceeding 1000m at baud rates up to 9600 bit/s with AWG26 or
   thicker cables, while Category 5 cables can reach up to 600m.  As an
   application layer protocol, despite its widespread application, the
   absence of encryption and authentication in Modbus protocol via
   serial links exposes plaintext data to risks such as MIM
   interception, modification under attacks such as side-channel
   analysis etc., particularly in long-distance or bridged network
   scenarios.  Enhancing Modbus serial link security requires
   introducing proper encryption and authentication methods tailored to
   varied deployment environments onsidering the characteristics of
   serial links.  A proposed security standard guide outlines
   lightweight encryption and authentication mechanisms to improve
   confidentiality and integrity while maintaining compatibility with
   existing Modbus devices, offering a practical upgrade path for secure
   industrial control systems.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-liu-iotops-modbus-seriallink-sec-spec/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-liu-iotops-modbus-seriallink-sec-spec-07.html

A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-liu-iotops-modbus-seriallink-sec-spec-07

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


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