Git Security: Stop Secrets and Unsafe Commits
Learn to keep secrets out of Git with push protection, pre-commit hooks, and Gitleaks, protect main with rulesets, sign commits, and respond to leaks.
What You'll Learn
Understanding Why Git History Never Forgets
Every other control in this module exists because of one fact: once a secret reaches a remote repository, you must assume someone has copied it.
Deciding What Must Never Be Committed
You cannot protect what you have not named, so the team needs one shared list of what stays out of Git.
Blocking Secrets with Push Protection and Pre-commit Hooks
The cheapest leak is the one that never leaves the developer's laptop, so the first layer tries to stop secrets before they are pushed.
Scanning Repositories with Gitleaks and TruffleHog
Hooks stop new leaks, but you also need to find secrets that are already in your history and catch anything the hooks missed.
Protecting Main with Rulesets, Branch Protection, and CODEOWNERS
Scanning finds problems. Branch rules make sure nothing reaches main without passing the checks and a second pair of eyes.
Signing Commits with SSH or GPG
Anyone with write access can set user.email to someone else's address and make a commit look like theirs. Signing closes that gap.
Skills You'll Master
Curriculum Index9 topics
Understanding Why Git History Never Forgets
Every other control in this module exists because of one fact: once a secret reaches a remote repository, you must...
Deciding What Must Never Be Committed
You cannot protect what you have not named, so the team needs one shared list of what stays out of Git.
Blocking Secrets with Push Protection and Pre-commit Hooks
The cheapest leak is the one that never leaves the developer's laptop, so the first layer tries to stop secrets before...
Scanning Repositories with Gitleaks and TruffleHog
Hooks stop new leaks, but you also need to find secrets that are already in your history and catch anything the hooks...
Protecting Main with Rulesets, Branch Protection, and CODEOWNERS
Scanning finds problems. Branch rules make sure nothing reaches main without passing the checks and a second pair of...
Signing Commits with SSH or GPG
Anyone with write access can set user.email to someone else's address and make a commit look like theirs.
Responding When a Secret Leaks
Leaks happen even with every layer in place. What matters is doing the steps in the right order.
Hands-on Lab: Secure a Test Repository End to End
You will build the four layers on a throwaway repository, trigger each one, and then delete everything.
Quick Reference and Common Mistakes
Quick reference Common mistakes Cleaning the history before revoking the credential is the most expensive ordering...
Career Impact
Roles that use the skills in this module.
- High Demand
DevSecOps Engineer
₹12L - ₹30L a year
- High Demand
DevOps Engineer
₹8L - ₹22L a year
- Growing
Security Engineer
₹14L - ₹35L a year
Next Modules
Related Guides
Practice on the Coding Sheet
Not a software engineer sheet. Every problem comes from real DevOps, SRE, Platform and Cloud interviews, from your first script to a system you build yourself.
Open the Coding SheetFrequently Asked Questions
No. Git keeps every commit, so the secret stays in the history and in every clone or fork made before the deletion. Revoke the credential first, then clean the history as a second step.
Yes. Anyone can run git commit with --no-verify, or never install the hook. That is why the same scan must also run in CI as a required check that nobody can skip.
Use Gitleaks for fast checks in hooks and CI. Use TruffleHog for audits of existing repositories, because it can test whether a found secret is still active and so tells you what to rotate first.
Signing proves who made a commit, which stops impersonation. It does not prove the code is safe, so treat it as an addition to code review and branch rules, not a replacement.