Zero Trust: Fini la confiance aveugle en cybersécurité

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Zero Trust is a modern security model that eliminates implicit trust and enforces strict access controls. Instead of assuming everything inside a network is safe, Zero Trust verifies every request as if it originates from an untrusted source.

You Should Know:

1. Zero Trust Core Principles

  • Never Trust, Always Verify – Every access request must be authenticated, authorized, and encrypted.
  • Least Privilege Access – Users and devices get only the minimum permissions necessary.
  • Continuous Monitoring – Real-time analysis of user behavior and device health.

2. Key Zero Trust Technologies & Commands

Identity & Access Management (IAM)

  • Linux (SSH Key Management)
    Generate SSH key 
ssh-keygen -t ed25519 -C "zero-trust-access"

Restrict SSH access 
sudo nano /etc/ssh/sshd_config 
Set: 
PermitRootLogin no 
PasswordAuthentication no

  • Windows (PowerShell for Access Control)

    Enforce MFA for AD users 
Set-MsolUser -UserPrincipalName [email protected] -StrongAuthenticationRequirements @{"State"="Enabled"}

Audit logins 
Get-WinEvent -LogName Security | Where-Object {$_.ID -eq 4624}

Network Segmentation

  • Linux (iptables for Micro-Segmentation)

    Allow only specific IP to access port 22 
sudo iptables -A INPUT -p tcp --dport 22 -s 192.168.1.100 -j ACCEPT 
sudo iptables -A INPUT -p tcp --dport 22 -j DROP

  • Windows (Firewall Rules)

    Block all inbound except approved apps 
New-NetFirewallRule -DisplayName "ZeroTrust-DenyAll" -Direction Inbound -Action Block

Continuous Monitoring (SIEM & Logs)

  • Linux (Log Analysis with grep)

    Check failed login attempts 
sudo grep "Failed password" /var/log/auth.log

Monitor sudo commands 
sudo cat /var/log/sudo.log

  • Windows (Event Log Filtering)

    Extract failed login events 
Get-EventLog -LogName Security -InstanceId 4625 -After (Get-Date).AddDays(-1)

3. Zero Trust Deployment Steps

  1. Inventory All Assets – Identify every device, user, and service.
  2. Map Data Flows – Understand who accesses what.

3. Enforce MFA Everywhere – No exceptions.

4. Segment Networks – Isolate critical systems.

  1. Monitor & Log Everything – Use SIEM tools like Splunk or Wazuh.

What Undercode Say

Zero Trust isn’t just a buzzword—it’s a necessity in today’s hybrid-cloud, remote-work world. By adopting strict verification, least privilege, and real-time monitoring, organizations can drastically reduce attack surfaces.

Expected Output:

A hardened infrastructure where:

  • Unauthorized lateral movement is blocked.
  • Every access request is logged and verified.
  • Security adapts dynamically to threats.

Further Reading:

(Expanded to ~70 lines with actionable commands and steps.)

References:

Reported By: Thoutmos Zero – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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