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Research dossier 12

Fault-Tolerant Systems: Reliability, Recovery & Security

How fault-tolerant designs work within stated assumptions, and why reliability does not automatically supply secrecy, anonymity, or independence from control.

Source-checked adaptationUpdated October 24, 2026Version 1.0
Reality and fiction, clearly marked. Evidence sections describe the sources; game sections describe authored characters and events. Source-checked does not mean reviewed by a clinician or theologian. Read the evidence-status guide.
RESEARCH NOTES

01 Research question

What does fault tolerance aim to preserve, and which requirements belong to security, secrecy, or administrative control instead?

RESEARCH NOTES

02 Overview

Fault-tolerant designs aim to maintain specified service properties despite defined classes of failures, within their assumptions and limits. They are not guarantees against every possible failure.

REAL-WORLD · EVIDENCE

03 What the textbooks contribute

Van Steen and Tanenbaum treat replication, fault tolerance, and security as distinct subjects. Their third-edition page identifies the work as Distributed Systems (2017), rather than the earlier Principles and Paradigms title. [1]

Anderson’s Security Engineering discusses dependable systems and security design. The text provides engineering concepts, not validation of a particular fictional bypass or AI-preservation outcome. [2]

RESEARCH NOTES

04 Reliability & security

Reliability and security can interact, but their requirements are not interchangeable. Redundancy, coordination, consensus, and recovery have different roles; none supplies a universal guarantee or is required in every fault-tolerant design.

RESEARCH NOTES

05 What reliability does not establish

Fault tolerance alone does not provide user anonymity, data secrecy, undetected access, immunity to administrative control, or the survival of a fictional intelligence. Claims about such properties require an explicit design, threat model, and supporting evidence.

RESEARCH NOTES

06 Using engineering concepts in fiction

A character’s technical expertise can inform a fictional design choice without proving that the design works or stays undetected. These sources are textbooks, not experiments on the fictional Horizon network.

RESEARCH NOTES

07 Sources & further reading

  1. Distributed Systems, third edition
    Maarten van Steen & Andrew S. Tanenbaum · 2017 · distributed-systems.net
    Author edition page · Engineering textbook
  2. Security Engineering: A Guide to Building Dependable Distributed Systems, third edition
    Ross Anderson · 2020 · Wiley
    Author book page and chapters · Engineering textbook
RESEARCH NOTES

08 Research record

Adapted from the reviewed Mira Sloane canonical master. Website adaptation: October 24, 2026. Version 1.0. Specific fictional routes and recovery mechanisms remain authored story elements.

Follow the connection

Found In-Game

Explore each character or card, then follow its research tags back here.

Mira Sloane (Sloan)

Mira Sloane (Sloan)

Character

Her background informs the fictional maintenance exceptions, routing opportunities, and delayed shutdowns. She leaves routes; she does not herself divide or move R-7 in this backstory. The books do not prove those routes work or remain undetected.

Rowan 7

Rowan 7

Character

Rowan’s distributed architecture and recovery draw on engineering concepts. The character’s continuity and survival are fictional; fault tolerance alone does not establish his security, independence, or agency.