Modern security architecture is about far more than just rolling out defences. To ensure a truly secure-by-design environment, organisations need to embed protections into every layer of their business, functioning as a cohesive system that defends users, secures data, and allows room for future growth.
In this next part of our ongoing series on security architecture, we’re exploring the five key domains that your strategy needs to cover, how to tackle them by utilising Microsoft security tools, and what an effective cyber defence should look like.
Identity – Securing access and trust
Identity has become the new perimeter of security. As users, partners, services and even AI agents now interact across multiple environments, it’s essential to ensure everyone is who they say they are. This helps build a zero-trust security architecture, verifying users with multi-factor authentication (MFA), conditional access policies, and least-privilege access principles to ensure credentials can’t be misused, whether by internal or external threats.
The Microsoft security stack features a range of identity-focused tools, including Microsoft Entra ID and Entra Conditional Access. These can form the baseline of a secure-by-design perimeter defence, making sure everyone who accesses critical systems and sensitive data is validated, without slowing down the pace of work with unnecessary checks from third-party tools.
To see what this would look like in practice, imagine a financial organisation, dealing with legacy authentication systems and overly permissive access controls. These factors mean that should a bad actor get a hold of user credentials, they have unrestricted access to the entire environment – and all the confidential data held within.
Quick wins (like rolling out MFA) can address the immediate risk, while developing an automated user provisioning system to manage accounts automatically helps to ensure identity governance without increasing the burden on IT teams.
Devices and networks – The first lines of defence
Every device used to access your systems, from laptops and desktops to mobiles and tablets, represents a potential vulnerability in your cyber defence, as do the networks that connect them. A secure-by-design approach needs to combine protection and productivity. This means segmenting networks, automatically applying patches and maintaining continuous endpoint monitoring to quickly detect and contain attacks.
For devices, the Microsoft security portfolio provides two powerful solutions: Microsoft Intune and Defender for Endpoint. The latter helps ensure devices stay secure, while the former provides an effective way to monitor and manage them remotely, allowing your team to keep users secure, no matter where they’re working from. Combined with our own network expertise, this ensures that everyone accessing your systems is doing so from a secured device and connects to a protected network.
Without centralised oversight and a secure-by-design device strategy, an organisation can quickly find itself at risk. Malware and ransomware can easily spread from compromised devices into the wider environment, taking advantage of poorly secured networks to jeopardise the whole business.
By building a unified endpoint management framework, onboarding each device to management solutions like Microsoft Intune, and deploying security measures that automatically quarantine high-risk endpoints, the organisation can maintain security for devices. Meanwhile, segmenting networks, modernising VPN usage, and implementing a zero-trust approach means networks can be defended without interfering with the day-to-day work of users.
Platforms and infrastructure – Securing the backbone
Platforms and infrastructure are the foundation of your IT, hosting applications, storing data, and connecting teams. Whether your infrastructure is on-premises, in the cloud, or hybrid, it’s vital that it’s well-defended. To ensure your infrastructure is truly secure by design, cyber defences need to exist at all levels and across all platforms – limiting access, monitoring for threats, and ensuring the latest patches are always promptly applied.
Microsoft security tools, including Microsoft Defender for Cloud, and the host of defences offered by Microsoft Azure, are critical for preventing intrusion. These services bring together monitoring, analytics, and automation to identify and remediate vulnerabilities before they can be exploited, keeping you ahead of the threat landscape.
Unsecured infrastructures serve as a valuable target for cybercriminals – not just for the data they hold, but the opportunity they represent. If they’re able to gain access to these systems, attackers can spin up their own workloads to mine cryptocurrency, distribute malware, and support their operations, while leaving legitimate organisations to foot the bill. Our approach to extending your security architecture across infrastructures and platforms helps mitigate this risk, implementing cyber defences and controls that limit access and ensure unauthorised changes are appropriately blocked.
This doesn’t just help keep your environment secure, but opens up avenues for further optimisation, with proactive cost tracking enabling the optimisation of your cloud spend, and a full audit of your architecture helping to uncover shadow workloads which consume resources but offer little benefit to the business as a whole.
Applications – Embedding security into development
Applications drive business innovation, and as more businesses seek to build their own apps, whether customer-facing or solely for internal use, they can be one of the most exposed parts of an IT environment. In order to keep data safe without compromising on user experience, security needs to be integrated into development workflows – moving towards DevSecOps best practices that ensure new releases embed security by design.
Microsoft Defender for Cloud Apps provides a comprehensive toolbox to ensure your applications are safe and expose instances of shadow IT which can undermine your security architecture. When combined with the management functionality of Microsoft Sentinel, teams can easily co-ordinate security, even for enterprise-scale application estates, covering third-party and software developed in-house.
In the real world, this can take many different forms – consider an eCommerce-focused business. Beyond the centrepiece of their application strategy – their storefront – every part of their business is contingent on SaaS applications for marketing, managing finances, and countless other use cases. Our secure-by-design approach to architecture can leverage the Microsoft security stack to make sure these applications are maintaining best practices.
This means that there’s no need to circle the wagons or re-think the overall application strategy, just an effective way to monitor potential threats or vulnerabilities and respond to them accordingly.
Data – Protecting the core of your business
Data is at the centre of every decision, transaction, and strategic initiative for modern businesses. It’s the fuel of countless processes, making it a critical domain for your security architecture. To enable effective data protection, organisations first need to understand what data they have, where it resides, and who can access it. This is especially important for organisations in the midst of deploying AI. These systems can ingest and resurface vast quantities of data, potentially exposing sensitive information to end users in the process.
Microsoft Purview is a pillar of effective data governance, providing an automated platform for flagging and locking down sensitive information, keeping it out of the reach of unauthorised users and AI platforms alike. Infrastructure-focused components of the Microsoft security stack also have their role to play, ensuring that data repositories are secure by design.
As an example, picture a legal services firm managing large volumes of confidential case files and personal information. Without proper data classification, even routine collaboration could result in a serious breach, and deploying AI could expose data to unauthorised users, representing a major lapse in regulatory compliance. Our security architects can secure sensitive information without locking the organisation out of innovation. Automated controls like Microsoft Purview can maintain compliance and ensure data is kept safe, even as the business grows.
Data is the end target of many cyberattacks, so ensuring your cyber defences are focused on it is vital. The result speaks for itself – a compliant, well-maintained, and scalable data protection framework that keeps the door open for future innovation.
Delivering across domains
Protecting each of these five domains is foundational for your security architecture. When robust cyber defences span each of them, they create a powerful defence-in-depth strategy, working in conjunction to deliver complete protection and lasting resilience.
Our security architects can help bring these layers into alignment, using Microsoft security measures already included in many Microsoft 365 licences to create a cohesive cyber defence that supports innovation as much as it safeguards it. If you’re ready to strengthen every layer of your environment, get in touch to book a consultation with one of our security architects.
