Blog | G5 Cyber Security

Data Isolation: A Practical Guide

G5 Cyber Security

TL;DR

Isolate your company data to limit damage from breaches and improve security. This guide covers practical steps using network segmentation, access controls, backups, and monitoring.

1. Understand Your Data

  1. Identify Sensitive Data: What information needs the most protection? (e.g., customer details, financial records, intellectual property).
  2. Data Mapping: Where is this data stored? (servers, cloud services, databases, laptops). Create a clear diagram or list.
  3. Classification: Categorise your data based on sensitivity level (e.g., Public, Internal, Confidential, Restricted). This will guide access control decisions.

2. Network Segmentation

Divide your network into smaller, isolated segments to contain potential breaches.

  1. VLANs (Virtual LANs): Create separate VLANs for different departments or data types. This logically separates traffic.
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  • Firewalls: Use firewalls to control traffic between segments. Implement strict rules allowing only necessary communication.
  • Microsegmentation: For cloud environments, use microsegmentation tools to create granular security policies around individual workloads.

    • 3. Access Control

    Limit who can access what data.

    1. Principle of Least Privilege: Grant users only the minimum necessary permissions to perform their jobs.
    2. Role-Based Access Control (RBAC): Assign permissions based on job roles, not individual users. This simplifies management.
    3. Multi-Factor Authentication (MFA): Require multiple forms of verification for access to sensitive data.
    4. Regular Reviews: Periodically review and update access controls to ensure they remain appropriate.

    4. Data Backups

    Create regular backups of your critical data.

    1. Backup Frequency: Determine how often to back up data based on its importance and change rate (e.g., daily, weekly).
    2. Offsite Storage: Store backups in a separate location from the primary data to protect against physical disasters. Cloud storage is a good option.
    3. Testing: Regularly test your backups to ensure they can be restored successfully.
    4. Encryption: Encrypt backups both in transit and at rest.

    5. Monitoring & Alerting

    Detect and respond to suspicious activity.

    1. Intrusion Detection Systems (IDS): Monitor network traffic for malicious patterns.
    2. Security Information and Event Management (SIEM): Collect logs from various sources and analyse them for security threats.
    3. Log Analysis: Regularly review logs to identify potential issues.
    4. Alerting: Configure alerts to notify you of critical events, such as unauthorized access attempts or data breaches.

    6. Data Loss Prevention (DLP)

    Prevent sensitive data from leaving your control.

    1. DLP Tools: Implement DLP tools to monitor and block the transfer of sensitive data outside authorized channels.
    2. Content Awareness: Configure DLP policies based on content, context, and user behaviour.

    7. Regular Security Assessments

    Identify vulnerabilities and weaknesses in your security posture.

    1. Vulnerability Scanning: Regularly scan your systems for known vulnerabilities.
    2. Penetration Testing: Hire a third-party to simulate an attack on your systems.
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