Zero trust architecture basics in Cybersecurity - Step-by-Step Execution

Concept Flow - Zero trust architecture basics

User or Device Requests Access

↓

Verify Identity and Device Health

↓

Check Access Policies

↓

Grant Limited Access

↓

Monitor and Log Activity

↓

Re-evaluate Continuously

↩Back to Verify Identity and Device Health

This flow shows how zero trust architecture always verifies users and devices before granting limited access and continuously monitors activity.

Execution Sample

Cybersecurity

User requests access
Verify user identity
Check device security
Apply access rules
Grant limited access
Monitor activity

This sequence shows the step-by-step process zero trust uses to control access securely.

Analysis Table

Step	Action	Check or Result	Next Step
1	User or device requests access	Request received	Verify identity and device health
2	Verify user identity	Identity confirmed or denied	If confirmed, check device health; else deny access
3	Check device health	Device meets security standards or not	If healthy, check access policies; else deny access
4	Check access policies	Determine allowed resources and permissions	Grant limited access accordingly
5	Grant limited access	Access granted with restrictions	Monitor and log activity
6	Monitor and log activity	Track user/device actions	Re-evaluate continuously
7	Re-evaluate continuously	Ongoing verification	Back to verify identity and device health
8	Access denied	Identity or device check failed	End process

💡 Access ends when identity or device health verification fails or user finishes session

State Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	After Step 5	Final
User Identity	Unknown	Confirmed or Denied	Confirmed or Denied	Confirmed or Denied	Confirmed	Confirmed or Denied
Device Health	Unknown	Unknown	Healthy or Unhealthy	Healthy or Unhealthy	Healthy	Healthy or Unhealthy
Access Level	None	None	None	Limited or None	Limited	Limited or None
Activity Log	Empty	Empty	Empty	Empty	Logs start	Logs updated continuously

Key Insights - 3 Insights

Why does zero trust verify identity every time instead of trusting once?

Because zero trust assumes threats can come anytime, it always re-checks identity and device health (see execution_table steps 7 and 2) to prevent unauthorized access.

What happens if the device health check fails?

Access is denied immediately (see execution_table step 3 leading to step 8), preventing risky devices from entering the network.

Why is access granted with restrictions instead of full access?

Zero trust limits access to only what is necessary (see execution_table step 4 and 5) to reduce damage if credentials are compromised.

Visual Quiz - 3 Questions

Look at the execution_table, at which step is the device health checked?

A Step 3

B Step 2

C Step 4

D Step 5

💡 Hint

Check the 'Action' column for device health verification in the execution_table.

According to variable_tracker, what is the state of 'Access Level' after step 4?

A None

B Limited or None

C Full access

D Unknown

💡 Hint

Look at the 'Access Level' row under 'After Step 4' in variable_tracker.

If the user identity is denied at step 2, what happens next according to execution_table?

A Access is granted

B Device health is checked

C Access denied and process ends

D Monitoring starts

💡 Hint

See the branch from step 2 in execution_table where identity is denied.

Concept Snapshot

Zero trust means never trust by default.
Always verify user identity and device health.
Grant only limited access based on policies.
Continuously monitor and re-verify.
Deny access immediately if checks fail.

Full Transcript

Zero trust architecture is a security approach where no user or device is trusted automatically. Every access request is verified by checking the user's identity and the device's security status. Access is granted only with strict limits based on policies. The system continuously monitors activity and rechecks identity and device health to prevent unauthorized access. If any check fails, access is denied immediately. This approach reduces risks by assuming threats can come from inside or outside the network at any time.