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Zero Trust & Secure by Design

Security is not a perimeter. It is a mindset that should be built into every layer of your environment, not bolted on at the edge.

Zero Trust is one of the most discussed concepts in cyber security, and one of the most misunderstood. It is not a product you can purchase or a platform you deploy in an afternoon. It is a security philosophy: one that assumes no user, device, or connection should be trusted by default, and that every access request must be verified, every time, regardless of where it originates.

When Zero Trust principles are applied consistently across identity, devices, access, data, and applications, the result is a security posture that is fundamentally harder to compromise and far more resilient when something does go wrong. Microsolve builds this kind of environment through our Secure by Design approach: security embedded from the outset, layered across every service we deliver, and aligned with the Australian Cyber Security Centre's (ACSC) own guidance for modern, defensible architecture.

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Zero Trust is a Mindset Not a Product

The traditional approach to security assumed that anything inside the network perimeter could be trusted. The firewall was the wall. If you were inside it, the system assumed you belonged there.

That model made sense when everyone worked from a fixed office, on company hardware, connected to a single network. It no longer reflects reality. Today, users access business systems from home, from mobile devices, from cloud applications, and from locations the organisation does not control. The perimeter does not exist in any meaningful sense, and relying on it as a primary security control is a structural vulnerability.

Zero Trust replaces that assumption with a different one: trust nothing by default. Every access request regardless of whether it comes from a known user, a managed device, inside the office, or from the cloud, is treated as potentially hostile until it is verified. Verification is continuous, not one-time. Access is granted based on identity, device health, context, and the principle of least privilege which is the minimum access needed to complete the task, and nothing more.

You cannot go to a security vendor and buy Zero Trust. Zero Trust is a methodology. It's a set of principles that shape how your entire security environment is designed and operated. The technology supports the principles. The principles come first.

 

Secure by Design: Security Embedded, Not Added

Zero Trust describes how access and trust should work. Secure by Design describes how security should be built into every aspect of the technology environment, not treated as a layer added after the fact.

The Australian Signals Directorate's ACSC formally defines Secure by Design as a proactive, security-focused approach that requires cyber threats to be considered from the outset, enabling mitigations through thoughtful architecture and design rather than reactive controls applied after vulnerabilities are found. In 2025, the ACSC published updated Foundations for Modern Defensible Architecture, aligning this guidance explicitly with Zero Trust principles and signalling that this approach has moved from best practice to expected standard for Australian organisations.

For Microsolve, Secure by Design is not a marketing position. It is the operational principle that shapes how we build, configure, and manage every service. When we deploy a new environment, configure a Microsoft 365 tenant, design a network, or onboard a new client, security is not an afterthought, it is designed in from the start.

The Five Secure by Design Foundations

Holistic Secure Organisation

Security is a whole-of-organisation responsibility, not just an IT function

Secure Technology Choices

Selecting and demanding technology that is built and configured securely by default

Secure Product Development

Building security into architecture and design, not applied as a remediation

Testing and Continuous Validation

Detecting vulnerabilities early through quality assurance and ongoing security testing

Operational Security and Resilience

Maintaining security posture over time through patching, monitoring, and response

Microsolve's approach to client environments reflects each of these foundations whether it's through the configuration standards we apply, the frameworks we align to, or the way we structure ongoing managed services.

Watch a video on Designing for Security

What Zero Trust Looks Like in Practice

Zero Trust is implemented across multiple layers.

No single control delivers a Zero Trust posture.

It is the combination of controls across identity, devices, network, applications, and data that creates the resilience the model is built on.

Identity is the New Perimeter

In a Zero Trust model, identity replaces the network perimeter as the primary security boundary. Every user must be verified before accessing any resource, not once they've reached the login stage, but continuously, with risk-based policies that can challenge or deny access if behaviour changes, a device becomes unhealthy, or context shifts unexpectedly.

This means strong authentication, with multi-factor authentication (MFA) as a non-negotiable baseline, combined with identity governance that ensures users only have access to what they need and that access is reviewed and revoked when it is no longer required.

Devices Must be Verified

A verified identity is only as trustworthy as the device it is coming from. In a Zero Trust environment, device health is assessed as part of every access decision. Managed devices with current patches, enabled security controls, and known configurations are treated differently from unmanaged or unhealthy devices which may be challenged, restricted, or denied access regardless of the user's credentials.

This is why endpoint management and endpoint protection are not separate from Zero Trust, they are integral to it.

Access is Least-Privilege by Design

Users, applications, and services should have the minimum level of access required to perform their function. Broad permissions and inherited access which are the accumulated rights that build up over time as people change roles, organisations grow, and systems are added without governance, are among the most common contributors to the blast radius of a security incident.

Least-privilege access design means permissions are deliberately granted, not assumed. It means access is reviewed regularly, not set and forgotten. And it means that when something does go wrong, the damage is contained to what the compromised identity or device could reach, and not to the entire environment.

Networks are Segmented

Rather than a flat network where any device can communicate freely with any other, a Zero Trust network is segmented. It is divided into zones that limit the ability of an attacker (or a compromised device) to move laterally. If one segment is compromised, the attacker cannot freely traverse to others.

Micro-segmentation takes this further, applying fine-grained controls at the individual workload or application level so that even within a segment, east-west traffic is controlled and verified.

Data is Classified and Protected

Knowing what data exists, where it is, how sensitive it is, and who should access it is foundational to Zero Trust. Data classification feeds directly into access policies, such as, sensitive data having stricter controls, and into monitoring priorities: changes to how sensitive data is accessed or moved are the most important signals to watch.

Monitoring and Response are Continuous

Zero Trust does not assume that prevention will always succeed. It assumes that breaches will occur and designs the environment to detect them early, contain them quickly, and recover with minimal impact. Continuous monitoring of access, behaviour, and system activity is not optional. It is how Zero Trust delivers on the promise of resilience rather than just the aspiration of prevention.

Making Zero Trust Practical with SecureStart

For most organisations, Zero Trust is not implemented overnight. It is built progressively, starting with the highest-impact foundations and expanding from there as the environment matures.

Microsolve's SecureStart programme is designed specifically for this. It provides a structured, staged pathway into a Zero Trust-aligned security posture. We begin with an honest assessment of where the organisation stands today, identifying the most meaningful gaps, and implementing the foundational controls that deliver the most security value immediately.

SecureStart is not a product. It is an engagement designed to help organisations understand their security posture, prioritise their next actions, and begin building a security environment that is defensible, measurable, and aligned with the ACSC's guidance without requiring an enterprise security team or a large upfront investment.

What SecureStart Covers:

Security Posture Assessment

A structured review of the current environment against Zero Trust and Secure by Design principles: identity, access, devices, data, network, and monitoring

Gap Analysis and Prioritisation

A clear, plain-English view of where the most significant vulnerabilities sit and what should be addressed first based on risk and impact

Foundational Controls Implementation

MFA, least-privilege access review, endpoint management, Microsoft 365 security configuration, and monitoring baselines

Roadmap to Maturity

A documented path forward, aligned to SMB1001 or Essential Eight frameworks as appropriate, that gives leadership a clear picture of where the security programme is heading

Ongoing Managed Security

SecureStart is the beginning of a managed relationship, not a one-off project. Microsolve manages and evolves the security environment as the organisation grows and the threat landscape changes

Learn more about Microsolve's cyber security services

Zero Trust and Australian Compliance

Zero-Trust-Digital-Ecosystem-600x

Zero Trust is no longer just a vendor concept or an enterprise aspiration. It is increasingly embedded in the frameworks and guidance that shape cyber security expectations for Australian organisations.

In February 2025, the ACSC released its Foundations for Modern Defensible Architecture. It's a guidance package that explicitly aligns with Zero Trust principles and provides practical guidance for organisations adopting this approach. The Protective Security Policy Framework (PSPF) 2025 release formally mandated Zero Trust adoption for Australian government entities.

For organisations operating in regulated industries, supplying government, or seeking SMB1001 or Essential Eight alignment, Zero Trust principles are not optional extras, they are the underlying architecture that makes those frameworks meaningful.

The Essential Eight controls including MFA, application control, least-privilege access, patching, and monitoring, are all expressions of Zero Trust principles applied to specific control areas. SMB1001's five pillars: technology management, access control, data protection, incident response, and staff security awareness, directly map onto the Zero Trust layers of identity, devices, data, network, and monitoring.

Microsolve's approach connects these frameworks to a coherent underlying philosophy so that compliance effort builds toward a defensible security posture, rather than producing a collection of point-in-time checkboxes.

Find out more about SMB1001 certification

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Frequently asked questions

What is Zero Trust security?

Zero Trust is a security philosophy built on the principle of never trust, always verify. Instead of assuming that users or devices inside the network are safe, Zero Trust requires every access request to be verified against identity, device health, and context continuously and regardless of where the request originates. It replaces the perimeter-based security model, which is no longer adequate for modern working environments.

Is Zero Trust a product you can buy?

No. Zero Trust is a security methodology. It's a set of principles that shape how an entire environment is designed and operated. Technology tools - identity platforms, endpoint management, network segmentation, monitoring - support the implementation of Zero Trust principles. But the principles themselves must be designed in, not purchased as a product.

What is Secure by Design?

Secure by Design is the principle that security should be built into the architecture and design of technology environments from the outset, not added as a remediation layer after vulnerabilities are found. The ACSC defines it as a proactive, security-focused approach that requires cyber threats to be considered from the start, enabling mitigations through thoughtful design rather than reactive controls.

Is Zero Trust relevant for small and mid-sized businesses?

Yes. Zero Trust principles are scalable. They do not require enterprise infrastructure or large security teams to implement. Foundational controls like MFA, least-privilege access, endpoint management, and continuous monitoring are achievable for organisations of any size and deliver significant security value immediately. Microsolve's SecureStart programme is specifically designed to make Zero Trust practical for Australian SMBs.

What is the ACSC's position on Zero Trust?

The ACSC released its Foundations for Modern Defensible Architecture in February 2025, formally aligning with Zero Trust principles and providing practical guidance for Australian organisations adopting this approach. The Protective Security Policy Framework (PSPF) 2025 mandated Zero Trust adoption for Australian government entities. Zero Trust has moved from theory to expected practice in the Australian security landscape.

How does Zero Trust relate to the Essential Eight?

The Essential Eight controls including MFA, application control, patch management, least-privilege access, and regular backups, are all practical implementations of Zero Trust principles in specific control areas. Implementing the Essential Eight systematically builds a Zero Trust-aligned posture even if the organisation has never explicitly framed it in Zero Trust terms.

What is the blast radius in cyber security?

The blast radius refers to the scope of damage that a security incident can cause, such as how far an attacker can spread from the point of initial compromise. Zero Trust limits the blast radius by enforcing least-privilege access (so compromised accounts can only reach a limited set of resources) and network segmentation (so compromised devices cannot move freely across the environment).

Where does SecureStart fit in a Zero Trust journey?

SecureStart is the structured entry point Microsolve uses to help organisations begin building a Zero Trust-aligned security posture. It starts with an honest assessment of the current environment, identifies the highest-impact gaps, implements foundational controls, and produces a documented roadmap for ongoing maturity, all without requiring the organisation to have an existing security framework in place.

How long does it take to implement Zero Trust?

Zero Trust is a direction, not a destination. Most organisations implement it progressively. Foundational controls come first, more advanced controls over time as the environment matures. Meaningful security improvements can be achieved quickly through foundational controls like MFA, access reviews, and endpoint management. A full Zero Trust architecture across a complex environment is typically a multi-year programme, managed as an ongoing discipline rather than a discrete project.

Security that is built in, not bolted on

Whether you are starting from scratch, reviewing an existing security posture, or looking for a structured path to Zero Trust alignment, SecureStart is the right starting point. It gives you a clear picture of where you stand and a practical programme for where you need to go.

Talk to us about SecureStart