Notes on Active Defense

Eleven papers on the architecture of active defense.

Written to argue about designs rather than products. The questions they end on are meant to be asked of us as readily as of anyone else — including the one about what we do not detect. Every paper is a free PDF; nothing here asks for your address.

Start here — The Platform

The eight-page booklet the series unpacks: one lake, two planes, and every capability an event consumer. Read this first if you want the shape of the thing before the arguments behind it.

8 pp · PDF →

The series

In order. Each stands alone, and each is short enough to read in one sitting.

PAPER 01

The gap between knowing and acting

Why a platform that only tells you things is structurally incapable of stopping them — and what closing the loop actually requires.

6 pp · PDF
PAPER 02

Everything is an event

An alert is a subgraph, not a row. What follows for storage, for correlation, and for what an analyst can ask afterwards.

6 pp · PDF
PAPER 03

The legitimacy problem

The question is not "is this malicious". Most of what matters is legitimate capability used by the wrong party, and that is a different problem.

6 pp · PDF
PAPER 04

Compiling what you learn

What a platform learns should become what it enforces. Detection that never reaches an enforcement point is a report with extra steps.

6 pp · PDF
PAPER 05

Bounded autonomy

Delegation is a design problem, not a setting. Blast radius, canary, rollback and refusal as first-class parts of an automated action.

6 pp · PDF
PAPER 06

Evidence that survives

Evidence should be a query, not a project. What it takes for an answer given two years from now to be the same answer.

6 pp · PDF
PAPER 07

The door is not the control

Authentication is a moment; trust is a duration. What a session is still asserting an hour after the login succeeded.

5 pp · PDF
PAPER 08

What we do not detect

A vendor who publishes no gaps has not found none. The case for a published, measured coverage gap — and what ours looks like.

5 pp · PDF
PAPER 09

Anything that emits a signal

The integration is where the data model gets decided. Why the decoder, not the dashboard, determines what you can ever ask.

5 pp · PDF
PAPER 10

One meter

How you are charged decides what you can see. A meter that punishes telemetry produces an estate with blind spots by design.

5 pp · PDF
PAPER 11

The vendor is part of your attack surface

We are the most privileged software you will install. What that obliges us to publish, and what you should be able to verify without asking.

5 pp · PDF
These are arguments, not a product manual. For what the platform does for one problem end to end, the solution descriptions are the shorter read; for what a review team can verify for itself, start with the trust & assurance brief.
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