Zero trust architecture

One stolen login should not open your whole business.

Most networks trust anyone who gets past the front door, so when an attacker gets one password they can often reach everything. We change that. Every sign-in is checked, every person reaches only what their job needs, and unknown devices stay out.

  • Built on Microsoft 365
  • Done in stages
  • ZTNA on Ultimate
Lines of light through a dark server corridor
Checked every timeWho it is, what device, and whether it makes sense.

What changes

What is different once it is in place.

Pick one to see how it works day to day.

Every sign-in is checked

Being in the office or on the VPN no longer counts as proof. Each login is checked for who it is, what device it is on and whether anything looks off.

  • Conditional Access in Entra ID

Blast radius

What could one stolen login reach today?

Pick whose password was stolen, then switch controls on and watch the reach shrink.

Whose password was stolen?
Controls in place

An illustration of a typical small business, not a scan of yours. Turn controls on to watch the reach shrink.

What the attacker reaches

4of 6 areas open

With just the password, the attacker signs in as this person.

  • Their mailbox
    Reachable
  • All shared files
    Reachable
  • Finance and payroll
    Reachable
  • Client database
    No access
  • The office network
    Reachable
  • Every account in the business
    No access

Why now

The front door is not the only way in.

Attackers now get in through unpatched systems more often than through stolen passwords, and almost half of breaches involve a supplier. Zero trust assumes one of them will work, and limits how far it gets.

Run the free gap check first

31%

of breaches started with an exploited vulnerability, now the top way in, up from 20%.

Verizon 2026 DBIR

48%

of breaches involved a third party such as a supplier, up from 30%.

Verizon 2026 DBIR

Where to start

Not sure how far off you are?

Run our free security gaps tracker first. Thirteen questions covering the controls SMB1001 and the Essential Eight ask about. Your answers stay in your browser, and you finish knowing which gaps to close first.

The sign-in half of zero trust, Conditional Access, multi-factor and least privilege, is covered in more detail on our identity and access page. The watching half is managed detection and response: alerts from odd sign-in behaviour reach an engineer who acts.

How it works

Done in stages, without stopping work.

  1. Step 1Map it

    Who uses what, from which devices, and where your important data sits.

  2. Step 2Lock sign-in

    Strong sign-in checks and device rules first, because that is where most attacks start.

  3. Step 3Cut access back

    Each person and each account reaches only what it needs.

  4. Step 4Keep it tight

    Sign-ins and access reviewed regularly as people and systems change.

Questions

What people ask before they call.

What is zero trust?

A way of setting up security where nothing is trusted just because it is inside your network. Every sign-in and every request is checked for who it is, what device it comes from and whether it makes sense, before access is given.

Is it a product we have to buy?

No. It is a set of rules built mostly from tools you already have in Microsoft 365, like Microsoft Entra ID and Intune. We set them up in stages so work is not disrupted.

Is it only for big companies?

No. Smaller businesses often find it easier, because they have fewer systems. Most of our clients have between 5 and 150 staff.

How does it relate to the Essential Eight?

Several Essential Eight strategies, such as multi-factor authentication and restricting admin rights, are zero trust controls, and they carry into ASD's new Essentials series. Doing this work moves you up the maturity levels.

Do we still need a VPN?

Usually not. Zero trust network access lets staff reach the specific apps they need from anywhere, without putting your whole network on the internet. It is part of our Ultimate plan, and we quote it on other plans.

How long does it take?

It is done in stages. Sign-in and device checks usually come first, then access clean-up. We agree the order and timing with you after mapping your setup.

Next step

What could one stolen login reach today?

Talk to us about where to start. We map your setup and tell you the first two or three changes that shrink the reach the most.

Chip, the Real Bytes support assistant

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