Pre-commit hooks are your first line of defense against accidentally sharing secrets with AI tools. Here's how to implement them effectively.
The Tools
detect-secrets
Entropy-based detection plus pattern matching. Low false positive rate, highly configurable.
git-secrets
AWS-focused but extensible. Simple configuration, works well for AWS-heavy environments.
TruffleHog
Comprehensive pattern library, supports regex and entropy. More thorough but higher false positive rate.
Configuration Best Practices
1. Start with low sensitivity, increase gradually
2. Whitelist known false positives explicitly
3. Add organization-specific patterns
4. Never allow bypass without documented exception
Sample Configuration
Your pre-commit config should include:
- High-entropy string detection
- Common credential patterns (AWS, API keys, etc.)
- Organization-specific patterns
- File type exclusions for known safe files
Enforcement
Make pre-commit hooks mandatory:
- Server-side hooks that reject commits without client-side evidence
- CI pipeline validation
- Regular audits of bypass requests
Pre-commit hooks won't catch everything, but they catch the easy mistakes that make up most incidents.
Marcus specializes in infrastructure automation and cloud-native security. He maintains several popular open-source Terraform modules and has architected deployments serving millions of users.
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