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Illumio announced on October 1, 2026, that John Kindervag and a group of cybersecurity practitioners had released Cyber Resilience at Machine Speed: The Zero Trust Model for the AI Era. Illumio describes it as a free download. Rather than a solo-authored technical manual, the book is presented as a collection of practitioner contributions about applying Zero Trust principles as AI, agentic systems, and non-human identities change security challenges.
What is the book about?
The book’s stated aim is to connect Zero Trust with cyber resilience: not only making unauthorized access harder, but limiting damage and sustaining operations if a compromise occurs. In a September 8, 2026 post, Kindervag, Illumio’s Chief Evangelist, described resilience this way: “Cyber resilience is the ability to absorb a compromise and keep operating through it, and Zero Trust is the strategy that produces it.” That is his framing of the book’s argument, not a demonstrated outcome for every Zero Trust deployment.
Illumio says the book follows a five-step Zero Trust model and addresses AI, agentic systems, and non-human identities. Its release highlights verification, least privilege, segmentation, policy-based controls, and containment. The publisher says readers will learn to identify critical assets, translate business needs into enforceable policies, and limit the impact of a breach.
From keeping attackers out to limiting what they can do
The book’s resilience framing gives particular attention to what happens after an attacker is already inside. In his September post, Kindervag said the contributors’ chapters shifted his view toward that stage of an attack. The practical distinction is between treating prevention as the whole goal and designing controls that can restrict movement and help an organization keep operating after a security failure.
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Why AI and machine identities figure in the discussion
The publisher presents AI and agentic systems as part of a changing environment in which automated activity and non-human identities must be considered in security policy. Its stated approach is to apply verification, least privilege, segmentation, and policy controls to those challenges. The release does not provide measured evidence that the book’s recommendations reduce risk by a particular amount.
Who contributed?
Illumio presents the book as assembled by Kindervag with contributions from cybersecurity leaders and practitioners. The contributor list and role descriptions below are those given in the October 1 announcement:
- Dr. Chase Cunningham, associated with Forrester’s Zero Trust eXtended framework.
- Clint Bruce, founder of Trident Response Group.
- George Finney, author of Project Zero Trust and CISO for The University of Texas System.
- Jason Garbis, Cloud Security Alliance Zero Trust Working Group co-chair and Zero Trust author.
- Jonathan Flack, contributor to Cloud Security Alliance Zero Trust initiatives.
- Lieuwe Jan Koning, ON2IT co-founder and CTO.
- Rich Mogull, Cloud Security Alliance Chief Analyst.
- Michelle Savage, co-author of Agentic AI + Zero Trust.
- Don Yeske, former Navy CTO and DHS cyber leader.
- Josh Woodruff, Agentic Trust Framework creator and Cloud Security Alliance working group co-chair.
- Tony Scott, former U.S. federal CIO.
Kindervag explained in Illumio’s announcement that he invited people he trusted to write chapters, adding: “A wise person once told me there are no great books, only great chapters.” The publisher’s contributor descriptions establish who it says took part; they are not an independent evaluation of the book’s recommendations.
What topics does the preview describe?
Illumio’s official preview describes material on Zero Trust and emerging threats, segmentation, examples of major breaches, translating business needs into policy, and using context and relationships in security controls. These are the publisher’s descriptions of the book’s coverage. A preview and release announcement do not, by themselves, establish how effective a security control will be in a particular organization.
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The publisher’s conceptual contrasts help explain the intended focus:
- Prevention and containment: seek to prevent unauthorized activity while also limiting damage if a compromise occurs.
- Broad access and least privilege: replace unnecessary access with permissions suited to a user’s or system’s needs.
- Flat network reach and segmentation: use boundaries to restrict how far an intruder or compromised system can move.
- Business intent and enforceable policy: translate organizational requirements into controls that can be applied in practice.
What is known about availability?
Illumio says the book is available as a free download on its website and offers an early-access preview. Books in Cyber’s 2026 Volume I listing also lists the title under John Kindervag. The available release information does not establish an Amazon listing, a physical edition, or a retail price, so readers should not assume those formats or options are available.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should readers assess its claims?
The book makes a favorable case for Zero Trust as a way to support resilience against AI-assisted attacks, but implementation matters. SecurityWeek’s October 1, 2026 analysis highlights the accuracy and adaptability of policy engines, as well as protection against tampering, as concerns for putting the approach into practice. That is the outlet’s analysis of the book’s argument, not a consensus finding or a measured security result.
For readers, the useful question is therefore not simply whether a book advocates Zero Trust, but whether its policies can be made accurate, maintained as systems and identities change, and protected from manipulation. The release and preview outline the themes; they do not report quantified outcomes or prove that following the recommendations will produce the same result in every environment.
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