security

Defense in depth layers security controls across network, application, data, and identity tiers. Each layer independently validates and restricts access, so compromising one layer doesn't expose the entire system. Combine network firewalls, input validation, encryption, and access controls to create redundant protection.

Least privilege grants users and services only the permissions they need to perform their specific role, minimizing damage from compromised credentials or insider threats. Audit permissions regularly and revoke access when no longer needed to maintain a scoped, auditable security posture.

Encryption at rest protects stored data using strong algorithms and key management; encryption in transit protects data flowing between systems using TLS/SSL. Combine both with credential storage best practices, such as hashing passwords and rotating keys, to satisfy end-to-end data protection requirements.

Input validation patterns enforce strict schemas, allowlists, and type checking on all user-supplied data before processing. Reject unexpected formats, escape special characters, and use parameterized queries to block SQL injection, command injection, and cross-site scripting attacks.

Secure logging records authentication events, access attempts, and system changes without exposing sensitive data, enabling you to detect breaches, audit compliance, and respond to incidents. Monitor logs continuously and retain them securely to investigate security events and enforce accountability.

Secure by default means denying access and dangerous operations unless explicitly allowed, setting restrictive permissions on resources, disabling unnecessary features, and requiring security review before changes. This posture shifts the burden from administrators remembering to harden systems to developers proving security is needed.