Your Guide to Zero Trust Security for the Mainframe

A modern playbook for U.S. enterprises securing mainframe environments with Zero Trust

Why Zero Trust is Critical for Mainframe Security

Mainframes still run some of the world’s most mission-critical workloads—but they’re not immune to modern cyber threats. With data breach costs in the U.S. hitting an average of $10.22 million in 2025, enterprise organizations can’t afford reactive security models.

Ensono’s Zero Trust Mainframe Security Guide is built for U.S. IT and security leaders who are modernizing legacy systems with a security-first mindset. This guide explains how to embed Zero Trust principles across your mainframe environment—from segmentation to continuous validation—without disrupting performance.

What’s Inside the Guide

Actionable strategies to strengthen your mainframe posture

• How to implement role-based access control and Just-In-Time access
• Reducing your blast radius through network segmentation and authentication
• Ensuring always-on audit readiness and proactive compliance
• Applying multi-factor authentication (MFA) and modern IAM practices
• Using safeguarded copies and vault-style data recovery strategies
• Designed to support Mainframe-as-a-Service (MFaaS) transformations, this guide shows how Zero Trust can improve resilience, reduce risk, and align with regulatory expectations.

Who Should Download This Guide?

This guide is a must-read for:

• CISOs, CIOs, and IT Security Directors managing mainframe workloads
• Infrastructure and operations leaders modernizing legacy environments
• Risk and compliance teams navigating NIST, ISO, or FedRAMP-aligned controls
• Any enterprise exploring a shift to MFaaS with a Zero Trust foundation

Why Ensono?

Ensono is a trusted partner in mainframe transformation. With our MFaaS offering, we deliver incremental modernization with embedded Zero Trust security, helping large enterprises transition legacy systems into agile, resilient, and audit-ready environments.

Download the guide now to protect your most critical assets with a Zero Trust approach designed for mainframe environments.