How to Generate and Use a GPG Revocation Certificate

A GPG revocation certificate allows you to invalidate a compromised or lost key. Generating it at key creation time is critical. This guide walks through the specific troubleshooting steps to diagnose and resolve GPG revocation certificate issues.

Before You Begin

Before you begin, be sure to have the following in place:

• A Linux server with the relevant software installed
• Access to the command line interface
• Appropriate permissions (root or sudo)

Quick Fix

Wrong

No revocation certificate generated on key creation

Wrong: Waiting until key compromise to create revocation cert

Right

gpg --output revoke.asc --gen-revoke KEYID && chmod 600 revoke.asc

Right: Generating revocation cert when the key is created

Output

Revocation certificate generated.\nPlease move it to a secure medium and keep it safe.\nTo revoke the key:\ngpg --import revoke.asc\ngpg --keyserver keyserver.ubuntu.com --send-keys KEYID

Prevention

To avoid future issues, follow these best practices:

• Generate the revocation certificate immediately after creating the key
• Store the revocation certificate offline (USB drive, printed QR code)
• Set restrictive permissions on the file (chmod 600)
• Test the revocation process on a test key before relying on it
• Upload the revoked key to keyservers so others know it is invalid

DodaTech Tools

For further assistance with any of the above issues, consider using DodaTech consulting services or DodaTech tutorials for more in-depth guidance.

Common Mistakes with revoke cert

1. Forgetting that lazy evaluation defers computation until the value is forced, causing space leaks with unevaluated thunks
2. Using return to exit a function early instead of wrapping a pure value in the monad
3. Mixing let bindings with <- bindings in do notation, producing type errors

These mistakes appear frequently in real-world GPG code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ