Cybersecurity — Zero Trust

What is Zero Trust?

"Never trust, always verify" security model.

Core principles

1. Verify explicitly: Always authenticate
2. Least privilege: Minimum access
3. Assume breach: Minimize blast radius

Implementation

class ZeroTrustAuth:
    def __init__(self):
        self.risk_scores = {}
    
    def verify(self, user, resource, context):
        # Check identity
        if not self.verify_identity(user):
            return False
        
        # Check device
        if not self.verify_device(context.device):
            return False
        
        # Check behavior
        if self.detect_anomaly(user, context):
            return False
        
        # Check resource access
        if not self.check_policy(user, resource):
            return False
        
        return True

Microsegmentation

# Network segments
segments = {
    'web': ['nginx'],
    'app': ['api', 'worker'],
    'data': ['database', 'cache']
}

# Access rules
rules = {
    'web': ['app'],
    'app': ['data'],
    'data': []  # No outbound
}

Best practices

1. Identity verification
2. Device trust
3. Network segmentation
4. Continuous monitoring
5. Least privilege access

Mini Practice

1. Implement identity verification
2. Set up device trust
3. Configure microsegmentation
4. Monitor access patterns

Up Next

Continue with Cloud Security - Cloud protection.