Why do you need a Zero Trust Model?

Traditional cybersecurity paradigms focus on network-based security strategies like firewalls and other tools to monitor user activities on the network. However, digital transformation and social environment factors have driven new cybersecurity strategies to focus on protecting end-users, assets and resources. This is the prototype of the ‘Zero Trust Model’.

In this new blog series, I’ll explain the reasons for transforming to a Zero Trust Model as well as the benefits and challenges of implementing Zero Trust Network Architecture. I’ll also cover how you might efficiently implement it.

What is a Zero Trust Model?

But first things first, what exactly do we mean by ‘Zero Trust’? Well, Zero Trust is not a technology, it’s a security model with a set of guiding principles for workflow, system design and operations that can be used to improve the security posture of any classification or sensitivity level.

Zero Trust is a transformative journey rather than a complete replacement of technology. Ideally you should evaluate the security risks in your business model to before you start shifting to Zero Trust. Yet, during the COVID-19 pandemic, many companies were forced to quickly change their central-breakout remote access VPN to a Zero Trust using cloud-based equivalents such as Netskope, Zscaler or Tailscale. They then had to progressively apply Zero Trust principles, process changes and technology solutions that protect their data assets and business functions as they went along.

Now, they are often left having to operate in a hybrid Zero Trust/ perimeter-based mode while continuing to invest in IT modernisation initiatives and improve business processes – not ideal.

Why do we need a Zero Trust Model?

In the new working environment that we find ourselves, we need to look at a Zero Trust Model for a number of reasons:

Remote work and BYOD policy for employees
In the post-COVID era, remote working and a BYOD (Bring Your Own Device) policy have become the new normal. The “castle-and-moat” network security model in fixed office locations and employer-owned devices cannot cater for every employee’s needs. More staff are working out of the office using their own devices and Wi-Fi networks which are less secure in a remote working environment than in an office. You need to take a micro-level approach to authenticate and approve every access request in your network to make sure it’s secure.

Digital transformation of customer experience
The customer journey is not limited to retail shops and customers are rapidly shifting their buying behaviour to the internet and mobile applications. Thousands of personal computers and devices across the globe connect to company networks to complete transactions. This means that identity verification is critical for customers before they access their confidential data.

The high complexity of network architecture
In response to the high demand for rapid and secure access to data, anytime and anywhere, your company may operate several internal and external networks. These can include on-premises systems and cloud environments. Perimeter-based network security is then insufficient once attackers breach it whereas Zero Trust Network Architecture adds additional security layers to identity verification, such as a least-privilege access control, multi-factor authentication and endpoint verification for improved security.

Zero Trust forms a strong defence line against cyberattacks

With all these social and network environment changes, the opportunity for your network to be attacked is much greater. The median cost of cyberattacks in the UK rose 29% in 2022 with an average attack costing a business nearly £25,000.

Legacy systems, regulations and compliance practices are no longer sufficient amid increasingly sophisticated threats. Cloud environments are attractive targets for cybercriminals aiming to destroy and steal confidential business data. Amongst these different types of cyberattacks, ransomware tactics have evolved and become the most significant threat.

The Zero Trust Model is another approach to combat the emerging threat landscape which legacy security systems and perimeter approaches can no longer adequately mitigate.

How CACI can help

CACI has cybersecurity experts who can improve the protection levels of your business. Capabilities include Zero Trust Network Architecture, Threat Analytics, Systems Hardening, Network Analytics and Next Generation Firewalls. We perform risk assessment to advise clients on what comprehensive cybersecurity they need.

We also have experts in Cloud Network on-ramp Connectivity such as Microsoft ExpressRoute, AWS DirectConnect, GCP Cloud Dedicated Connect) and SASE/SdP/VPN technologies such as Zscaler and Tailscale.

In my next blog, I will be discussing the benefits and the challenges of implementing Zero Trust Network Architecture. However, if you want the whole story, have a read of our Zero Trust Model whitepaper where we cover everything in these blogs and more. Download your copy now.

Notes:
[1] Zero Trust Network Architecture (nist.gov)
[2] Will Rishi Sunak reassess UK cybersecurity policies? (openaccessgovernment.org)