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SEC-005·SEC Track·Advanced·20–100 hrs saved

Retire the Trusted Internal Network — Design a Zero Trust Architecture That Earns Trust Instead of Assuming It

A CISO-grade workflow to replace perimeter security with continuous, evidence-based verification across identities, devices, networks, applications, workloads, and data.

3Phases
10Quick wins
20–100Hours saved
2Deliverables

Executive Brief

Your Challenge

Your security model still assumes that anything inside the network can be trusted. That assumption made sense when work happened on managed devices behind a firewall — but your organization now runs on cloud, SaaS, remote work, contractors, APIs, containers, and AI. Every one of those breaks the perimeter, and a flat internal network with excessive admin privileges and broad VPN access means a single identity compromise can move laterally to almost anything.

Common Obstacles

The failure modes are predictable. Teams treat Zero Trust as a product purchase, or believe MFA alone constitutes it. Standing privilege never gets reduced, workload and non-human identities go ungoverned, and device health is never factored into an access decision. The hardest trap is measuring technology deployment instead of risk reduction — declaring victory when Conditional Access is 'on' while lateral movement is still trivial and trust is still granted at login and never re-evaluated.

The ABME Approach

This workflow does it as an architecture, in the right order. Assess current maturity across every pillar — identity, devices, networks, applications, data, workloads, visibility — then design a target architecture where every access decision evaluates identity, device compliance, session risk, and context, and trust is recalculated throughout the session rather than only at sign-in. The prompt pack produces the maturity assessment, pillar reviews, and roadmap; a maturity model and metrics set anchor progress to measurable risk reduction, not tool counts.

Insight Summary

The objective of Zero Trust is not to eliminate trust — it is to continuously earn trust based on measurable evidence. An architecture that grants trust once at login and never re-checks it is perimeter security with extra steps.
phase-1

Identity is the new perimeter. If device health, sign-in risk, and privilege are not inputs to the access decision, network location is silently still your trust boundary.

phase-1

Measuring technology deployment instead of risk reduction is how organizations declare Zero Trust 'done' while lateral movement stays trivial.

phase-2

Standing privilege is the single largest amplifier of identity compromise. Permanent admin assignments convert one stolen credential into full control; just-in-time activation shrinks the window that matters.

phase-2

A VPN that grants broad network access after authentication is a Zero Trust anti-pattern — authentication is not authorization to the entire network.

phase-3

Trust must be re-evaluated after privilege changes, device risk changes, impossible travel, and token-theft indicators — not only at the moment of sign-in.

tactical

Govern workloads and non-human identities — managed identities, service principals, secrets, certificates — with the same rigor as human users, or they become the ungoverned path in.

The Journey

Three phases; each lists the tools you'll use there.

1

Assess Current State and Trust Assumptions

Evaluate maturity across every Zero Trust pillar and surface where implicit trust still lives.
  • Establish Zero Trust principles and assessment objectives
  • Evaluate each pillar: identity, devices, networks, applications, data, workloads, visibility
  • Map how current access decisions are made and where trust is assumed
  • Locate the organization on the five-level maturity model
  • Define success metrics and the current baseline
Zero Trust Architecture PromptValidation Checklist
2

Design the Target Architecture

Define identity-centric, least-privilege, segmented architecture and the trust-decision model.
  • Design the trust-decision model evaluating identity, device, session, and context
  • Define least-privilege and just-in-time administration
  • Modernize network access with ZTNA and microsegmentation
  • Establish device trust as an access input
  • Govern workload and non-human identities
Zero Trust Architecture Prompt
3

Build the Roadmap and Continuous Verification

Sequence the executive roadmap, wire continuous verification, and anchor to risk-reduction metrics.
  • Sequence phased and twelve-month roadmap by business value
  • Implement continuous verification and Continuous Access Evaluation
  • Enhance data protection and workload runtime protection
  • Integrate AI-assisted detection and security automation
  • Track Zero Trust metrics tied to risk reduction, not deployment
Validation Checklist

What's Inside the Execution Layer

Numbered deliverables grouped by phase. Membership unlocks every tool.

1. PHASE 2Prompt Packprotected

Zero Trust Architecture Prompt

A single senior-architect prompt that assesses or designs an enterprise Zero Trust architecture across every pillar and produces the full deliverable set.
Use this to
  • Assess current Zero Trust maturity across all pillars
  • Generate pillar reviews, a roadmap, metrics dashboard, and risk register
  • Separate confirmed findings from assumptions and unknowns
Included with membership — $20/mo

Primary AI Prompt

Start here with your environment details for either an assessment or a target-state design.
You are a senior Zero Trust architect, enterprise security architect, cloud security architect, identity architect, and CISO advisor.Design or assess an enterprise Zero Trust architecture.Evaluate:• Identity• Authentication• Authorization• Devices• Networks• Applications• Data• Workloads• Monitoring• Incident response• GovernanceFor each pillar:- Assess current maturity- Identify architectural weaknesses- Identify trust assumptions- Recommend improvements- Estimate implementation effort- Estimate business valueSeparate:• Confirmed Findings• Assumptions• UnknownsProduce:1. Executive Summary2. Zero Trust Maturity Assessment3. Identity Architecture Review4. Device Trust Assessment5. Network Modernization Plan6. Application Security Review7. Data Protection Strategy8. Workload Protection Strategy9. Monitoring Strategy10. Governance Recommendations11. 12-Month Roadmap12. Metrics Dashboard13. Risk Register14. Executive RecommendationsDo not assume network location is a valid trust indicator.Require human validation before recommending production architecture changes.
2. PHASE 3Checklistprotected

Validation Checklist

Confirm the Zero Trust architecture is actually in place across every pillar before treating it as complete.
Use this to
  • Verify controls exist across identity, device, network, application, data, and governance
  • Confirm executive sponsorship and metrics are established
  • Catch pillars where implicit trust still remains
Included with membership — $20/mo

Validate the architecture against each pillar:

Identity

Devices

Network

Applications

Data

Governance

🔒 The full execution layer — every checklist, matrix, and the prompt pack — is included with ABME membership.

Unlock Full Blueprint

Full Playbook

Overviewpublic

Zero Trust is a security architecture—not a single product—that assumes no identity, device, workload, application, network, or connection should be trusted automatically.

Traditional security assumed:

“Trust everything inside the network.”

Zero Trust assumes:

“Never trust. Continuously verify.”

Verification should be based upon:

  • Identity
  • Authentication strength
  • Device health
  • User behavior
  • Location
  • Application sensitivity
  • Resource sensitivity
  • Session risk
  • Threat intelligence
  • Business context

The objective is not to eliminate trust.

The objective is to continuously earn trust based on measurable evidence.

Business Problempublic

Most organizations evolved around perimeter-based security.

Typical symptoms include:

  • Flat internal networks
  • Excessive administrator privileges
  • VPN providing broad network access
  • Shared credentials
  • Weak segmentation
  • Legacy authentication
  • Long-lived sessions
  • Minimal device validation
  • Inconsistent cloud controls
  • Excessive application permissions
  • Broad file share access
  • Limited visibility into lateral movement

As organizations adopt:

  • Cloud
  • SaaS
  • Remote work
  • Mobile devices
  • Contractors
  • APIs
  • Containers
  • AI

traditional perimeter security becomes increasingly ineffective.

Expected Outcomepublic

After completing this workflow the organization should have:

  • Zero Trust strategy
  • Current-state assessment
  • Target architecture
  • Identity trust model
  • Device trust model
  • Network trust model
  • Application trust model
  • Data protection strategy
  • Workload protection strategy
  • Monitoring strategy
  • Continuous verification model
  • Executive roadmap
  • Implementation phases
  • Success metrics
  • Governance model
  • Risk register

🔒 The complete playbook — reference models, worked examples, and operational guidance — is included with ABME membership.

Unlock Full Blueprint

Zero Trust Principlesprotected

Principles

A mature architecture should embrace these principles:
  • Verify explicitly.
  • Use least privilege.
  • Assume breach.
  • Continuously evaluate trust.
  • Minimize blast radius.
  • Segment aggressively.
  • Protect identities first.
  • Authenticate strongly.
  • Authorize dynamically.
  • Encrypt by default.
  • Monitor continuously.
  • Automate where appropriate.
  • Prefer identity over network location.
  • Reduce standing privilege.
  • Validate continuously—not only at login.

Assessment Objectivesprotected

Evaluate:

  1. Identity architecture
  2. Authentication
  3. Authorization
  4. Endpoint security
  5. Network segmentation
  6. Cloud security
  7. Application security
  8. Data protection
  9. Privileged access
  10. Monitoring
  11. Automation
  12. Recovery
  13. Governance

Zero Trust Pillarsprotected

Identity

Review:

  • MFA coverage
  • Passkeys
  • Passwordless authentication
  • Conditional Access
  • Risk-based authentication
  • Identity lifecycle
  • Privileged Identity Management
  • Guest governance
  • Service identities
  • Workload identities

Devices

Assess:

  • Device inventory
  • Compliance
  • Encryption
  • EDR
  • Patch status
  • Secure Boot
  • TPM
  • Jailbroken/rooted devices
  • Device ownership
  • BYOD controls

Networks

Evaluate:

  • Segmentation
  • Microsegmentation
  • VPN replacement
  • Software-defined perimeter
  • Secure Access Service Edge (SASE)
  • Firewall policy
  • East-west traffic
  • DNS security
  • Private access

Applications

Review:

  • Authentication
  • Authorization
  • API security
  • Application registrations
  • Secrets
  • Certificates
  • Session management
  • Administrative interfaces
  • Application ownership

Data

Assess:

  • Classification
  • Encryption
  • DLP
  • Rights management
  • Key management
  • Retention
  • Data residency
  • Sensitive repositories

Workloads

Review:

  • Containers
  • Kubernetes
  • Virtual machines
  • Serverless
  • Cloud workloads
  • Managed identities
  • Secrets
  • Runtime protection

Visibility

Evaluate:

  • Logging
  • SIEM
  • UEBA
  • Threat detection
  • Identity monitoring
  • Endpoint telemetry
  • Cloud telemetry
  • Incident response integration

Trust Decisionsprotected

Every access decision should evaluate:

  • Identity confidence
  • Authentication method
  • Device compliance
  • User risk
  • Sign-in risk
  • Resource sensitivity
  • Location
  • Network
  • Time
  • Behavioral anomalies
  • Threat intelligence
  • Existing session state

Trust should be recalculated throughout the session—not only at sign-in.

Identity-Centric Securityprotected

Identity becomes the new perimeter.

Review:

  • Identity providers
  • Federation
  • Conditional Access
  • Continuous Access Evaluation
  • Adaptive authentication
  • Passwordless adoption
  • Privileged access
  • Service identities
  • Workload identities

Least Privilegeprotected

Evaluate:

  • Permanent privilege
  • Administrative separation
  • Just-In-Time administration
  • Role-based access
  • Attribute-based access
  • Delegation
  • Temporary elevation

Device Trustprotected

Device trust should include:

  • Managed device status
  • Compliance
  • Encryption
  • EDR health
  • Patch level
  • Malware status
  • Risk score
  • Secure Boot
  • Hardware-backed security

Access decisions should change if device posture changes.

Network Modernizationprotected

Traditional VPNs should be evaluated against:

  • Application-specific access
  • Identity-aware proxies
  • Zero Trust Network Access (ZTNA)
  • Microsegmentation
  • SASE
  • Private access gateways

Microsegmentationprotected

Review segmentation between:

  • User networks
  • Server networks
  • Management networks
  • Production
  • Development
  • Test
  • OT
  • Cloud workloads
  • Kubernetes namespaces

Goal:

Prevent lateral movement.

Continuous Verificationprotected

Reevaluate trust after:

  • Privilege changes
  • Device risk changes
  • Identity risk increases
  • Geographic anomalies
  • Credential changes
  • Malware detection
  • Impossible travel
  • Token theft indicators
  • Session anomalies

Session Protectionprotected

Evaluate:

  • Session lifetime
  • Token lifetime
  • Continuous Access Evaluation
  • Token revocation
  • Reauthentication
  • Session monitoring
  • Idle timeout
  • High-risk session termination

Application Trustprotected

Applications should validate:

  • User identity
  • Device
  • Session
  • Token
  • API authorization
  • Resource authorization
  • Context
  • Least privilege

Applications should not assume the network is trusted.

Data-Centric Securityprotected

Protect data through:

  • Classification
  • Encryption
  • Access controls
  • DLP
  • Rights management
  • Watermarking
  • Activity monitoring
  • Conditional access

Workload Identityprotected

Govern:

  • Managed identities
  • Service principals
  • Application identities
  • Secrets
  • Certificates
  • Short-lived credentials
  • Rotation
  • Ownership

Zero Trust Metricsprotected

Track

Metrics to track for Zero Trust progress:
  • MFA coverage
  • Passwordless adoption
  • Permanent administrator count
  • JIT activation rate
  • Conditional Access coverage
  • Device compliance
  • Managed-device percentage
  • Microsegmented workloads
  • High-risk sign-ins
  • Session revocations
  • DLP incidents
  • Identity-related incidents
  • Lateral movement attempts
  • Mean time to contain identity compromise

Maturity Modelprotected

Level 1 — Perimeter Focused

  • VPN centric
  • Weak identity controls
  • Flat network

Level 2 — Identity Enabled

  • MFA
  • Conditional Access
  • Device management

Level 3 — Policy Driven

  • Least privilege
  • Risk-based access
  • Segmentation
  • Central monitoring

Level 4 — Adaptive

  • Continuous verification
  • Behavioral analytics
  • Automated response
  • Broad microsegmentation

Level 5 — Optimized

  • Identity-first architecture
  • Passwordless
  • Minimal standing privilege
  • Dynamic policy
  • Continuous validation
  • Automated risk reduction

Executive Roadmapprotected

Phase 1

  • MFA everywhere
  • Eliminate legacy authentication
  • Inventory identities
  • Deploy Conditional Access
  • Measure device compliance

Phase 2

  • Reduce standing privilege
  • Implement JIT access
  • Deploy ZTNA
  • Improve segmentation
  • Govern workload identities

Phase 3

  • Expand adaptive access
  • Implement Continuous Access Evaluation
  • Improve workload protection
  • Increase automation
  • Integrate AI-assisted detection

Example Findingsprotected

SEC-005-001 — Excessive Standing Privilege

Severity: Critical

Permanent administrator assignments significantly increase identity compromise risk.

Recommendation:

Transition administrative roles to just-in-time activation using Privileged Identity Management with approval, MFA, and session logging.

SEC-005-002 — VPN Provides Broad Network Access

Severity: High

Remote users receive unrestricted network access after authentication.

Recommendation:

Adopt Zero Trust Network Access (ZTNA) with application-specific access, device compliance checks, and continuous session evaluation.

SEC-005-003 — Device Trust Not Evaluated During Access

Severity: High

Conditional access decisions do not consider endpoint compliance or security posture.

Recommendation:

Require compliant, managed, and healthy devices for access to sensitive applications and data.

Automation Opportunitiesprotected

  • Risk-based access decisions
  • Conditional Access policy evaluation
  • Device-compliance enforcement
  • Session-risk monitoring
  • Token revocation
  • Privileged-access activation
  • Identity anomaly detection
  • Microsegmentation policy validation
  • Executive reporting
  • Zero Trust maturity tracking

Pro Tipsprotected

  • Identity is your primary security perimeter.
  • Eliminate implicit trust wherever practical.
  • Prefer application access over network access.
  • Continuously evaluate trust signals.
  • Reduce standing privilege aggressively.
  • Make device health part of every access decision.
  • Protect workloads and non-human identities with the same rigor as users.
  • Measure business risk reduction rather than technology deployment.
  • Roll out Zero Trust incrementally, prioritizing high-value systems first.
  • Balance security improvements with user experience to encourage adoption.

Common Mistakesprotected

  • Treating Zero Trust as a product purchase
  • Believing MFA alone is Zero Trust
  • Trusting internal networks by default
  • Ignoring workload identities
  • Leaving standing privilege in place
  • Building overly complex Conditional Access policies
  • Failing to measure device trust
  • Treating Zero Trust as a one-time project
  • Ignoring user experience
  • Measuring technology deployment instead of risk reduction

Brian Diamond

Founder, BrianOnAI

Twenty-five years designing, operating, and governing enterprise infrastructure — from MSP operations across dozens of client environments to enterprise infrastructure leadership. This blueprint codifies the operating model he's implemented in production, not theory.

Related Blueprints

Design a Secure Cloud Landing ZoneDesign Cloud Identity and Access ControlsReview Cloud Security and ConfigurationPerform an Enterprise Security AssessmentDevelop an Enterprise Incident Response ProgramBuild a Vulnerability Management ProgramDesign Identity Governance and AdministrationDesign and Optimize a Security Operations Center (SOC)Design an Enterprise Data Protection and DLP Program

⚠ Normalization Warnings — 10 for review

  • CLASSIFICATION TO CONFIRM: 'Zero Trust Principles' classified as body/reference (a consulted principle set). Alternative: body/prose. Rendered as a single-tier list.
  • CLASSIFICATION TO CONFIRM: 'Zero Trust Metrics' classified as body/reference (a consulted metric list). It is not filled in on-page, so not a matrix/tool. Confirm.
  • CLASSIFICATION TO CONFIRM: 'Executive Roadmap' (Phase 1/2/3) classified as body/reference tiers because it is a distinct architectural sequencing reference separate from the playbook 'Twelve-Month Roadmap' (which was mapped to playbook.roadmap by quarter). Both roadmap-like sections exist in the doc; confirm this split is desired rather than merging.
  • CLASSIFICATION TO CONFIRM: 'Maturity Model' classified as body/reference with five tiers (levels consulted, not completed). High confidence.
  • RESTRUCTURE: The seven H2 pillar subsections (Identity/Devices/Networks/Applications/Data/Workloads/Visibility) grouped under a single body/group 'Zero Trust Pillars' to avoid a flat list. Numerous standalone assessment H1s (Trust Decisions, Identity-Centric Security, Least Privilege, Device Trust, Network Modernization, Microsegmentation, Continuous Verification, Session Protection, Application Trust, Data-Centric Security, Workload Identity) were left as individual body/prose sections; consider grouping them under an additional 'Architecture Components' group if the page renders too flat.
  • CLASSIFICATION TO CONFIRM: 'Example Findings' classified as body/example with severity/recommendation pattern rendered verbatim (H3 subheads preserved). Not a reference severity model — these are worked findings.
  • TOOL NAMING: 'Primary AI Prompt' is a single prompt; wrapped as a prompt_pack tool named 'Zero Trust Architecture Prompt' with one prompt. Doc has no separate Follow-Up Prompts section. 'when' guidance line is an editorial addition; prompt text is verbatim (note original had no line breaks between bullet items — preserved as-authored).
  • OVERLAY DERIVED: Phases, phase steps, and tool phase assignments were derived from the doc's assessment→design→roadmap flow; the doc does not label explicit phases for the overall workflow (Executive Roadmap Phase 1/2/3 are content, not the workflow's operational phases). Confirm phase mapping.
  • STATS: deliverables set to 2 (the two tools). The Expected Outcome section lists 16 conceptual deliverables; using tool count per schema convention. Confirm.
  • PLAYBOOK SPLIT: 'Common Mistakes', 'Automation Opportunities', 'Pro Tips', 'Quick Wins', and 'Twelve-Month Roadmap' mapped to flat playbook lists (no subsection prose). playbook.security_considerations left empty — the doc has no dedicated Security Considerations tail section (security content is the whole document's subject).

SEO Block

  • Title tag: Design a Zero Trust Security Architecture | ABME (48 chars)
  • Meta: Replace implicit network trust with continuous, evidence-based verification — a phased Zero Trust architecture across identity, device, network, and data. (154 chars)
  • Schema: HowTo · noindex: false
  • Related: sec-001, sec-002, sec-003, sec-004, sec-006, sec-007, cl-002, cl-003, cl-008
  • Keywords: zero trust architecture, zero trust security, continuous verification, identity centric security, least privilege access, zero trust network access, ztna, microsegmentation, conditional access, zero trust maturity model
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