How to Handle Sensitive Data Securely in Terraform

Every real-world infrastructure deployment involves secrets—database passwords, API keys, and TLS certificates. The number one security mistake engineers make is letting those secrets leak into their codebase or terminal outputs. For todays Terraform Challenge, I built an impenetrable wall around my infrastructure's sensitive data using AWS Secrets Manager. Here is the definitive guide to the three ways secrets leak in Terraform, and exactly how to close every single path. Leak Path 1: Hardcoded in .tf Files The Mistake: Writing a secret directly into a resource argument. The moment you run git add, that password is permanently stored in your version control history for anyone in your organization (or the public) to see. ❌ Vulnerable Pattern: resource "aws_db_instance" "app_database" { username = "admin" password = "SuperSecretPassword123!" # Never do this! } ✅ Secure Alternative (AWS Secrets Manager): Instead of typing the password, create it manually in AWS Secrets Manager. Then, use