Traditionally, the IT industry has relied on perimeter security strategies to protect its most valuable resources like user data and intellectual property. These security strategies involved using firewalls and other network-based tools to inspect and validate users going into and out of the network. However, digital transformation and the move to hybrid cloud infrastructure are changing the way industries do business. Relying on a network perimeter is no longer sufficient.

Many organizations are also adjusting their business models. They're offering customers new digital experiences they need and want while also enabling a global and disparate workforce. Recent events have only accelerated this digital transformation journey. Suddenly, organizations have thousands of individuals connecting from home computers outside an IT department's control. Users, data and resources are spread across the globe, making it difficult to connect them quickly and securely. And without a traditional on-premises infrastructure for protection, employees' home environments are more vulnerable to compromise, putting the business at risk.

Complicating things further, many enterprises are currently operating with a patchwork of security solutions and tools with poor integration. And as a result, security teams are spending more time on manual tasks. They lack the context and insights needed to reduce their organization's attack surface effectively. A rise in data breaches and an increase in global regulations have made protecting networks difficult. For context, the average cost of a data breach is almost USD 4 million in lost business and fines.

Applications, users and devices need fast and secure access to data, so much that an entire industry of security tools and architectures has been built to protect it. Zero trust addresses the security needs of this data-driven hybrid cloud environment. It provides organizations with adaptive and continuous protection for users, data and assets, plus the ability to manage threats proactively. In other words, this practice of never trust and always verify aims to wrap security around every user, device and connection for every single transaction. Applying a zero trust framework can also help defenders gain insights across their security business. They can enforce security policies consistently and detect and respond to threats faster and in a precise way. However, it also produces several corollary benefits, such as:

• Enhanced network performance due to reduced traffic on subnets
• Improved ability to address network errors
• More simplified logging and monitoring process due to the granularity
• Quicker breach detection times

Developed by John Kindervag in 2010 while a principal analyst at Forrester Research, a zero trust architecture is a broad framework that promises effective protection of an organization’s most valuable assets. It works by assuming that every connection and endpoint is considered a threat. The framework protects against these threats, whether external or internal, even for those connections already inside. In a nutshell, a zero trust network:

• Logs and inspects all corporate network traffic
• Limits and controls access to the network
• Verifies and secures network resources

To expand, the zero trust security model ensures data and resources are inaccessible by default. Users can only access them on a limited basis under the right circumstances, known as least-privilege access. A zero trust security model verifies and authorizes every connection, such as when a user connects to an application or software to a data set via an application programming interface (API). It ensures the interaction meets the conditional requirements of the organization’s security policies. A zero trust security strategy also authenticates and authorizes every device, network flow and connection based on dynamic policies, using context from as many data sources as possible.

To successfully implement a zero trust architecture, organizations need to connect information from across each security domain. Security teams across the company must agree on priorities and align on access policies. They must secure all connections across the business, from data to users and devices to applications, workloads and networks. This architecture requires a well-planned strategy and roadmap to implement and integrate security tools to achieve specific business-focused outcomes. To make a zero trust model work, adopters must:

• Make an organization-wide commitment.
• Catalog all IT and data assets and assign access rights based upon roles.
• Lock down some common vulnerabilities.
• Classify data for a data-centric approach (link resides outside of ibm.com).
• Segment networks to prevent lateral movement  (link resides outside of ibm.com), a culprit in data breaches.
• Isolate and protect workloads during virtual machine and cloud server cross-movement.

It might seem like a limiting process from an outside perspective. But a zero trust model's successful implementation can help bring context and insight into a rapidly evolving attack surface to the security team and improve the users' experience.

Like a virtual private network (VPN), zero trust network access (ZTNA) provides secure remote access to applications and services. Unlike a VPN, a ZTNA is based on defined access control policies, denying access by default and providing user access to services when explicitly granted. ZTNA establishes secure access after it authenticates a user through a secure, encrypted tunnel, allowing users to see only applications and services they have permission to access. This protection method prevents lateral attacker movement, a vulnerability that cybercriminals leverage to scan and pivot to other services. With ZTNA, organizations can implement location and device-specific access control policies, preventing possibly compromised devices from connecting to its services.