Since 2017 GitGuardian has been monitoring all public activity on GitHub. Now in a new product called Has My Secret Leaked you can check if your secrets on GitHub. In this video, Mackenzie runs through how to use both the web interface and CLI tool GGShield to check if your secrets have ever been exposed on GitHub, regardless of if they have since been deleted.

Has My Secret Leaked is a service that will first create a secure hash of your secret locally then match it to other hashes in the GitGuardian database.

HMSL website: https://www.gitguardian.com/hasmysecretleaked
GGShield GitHub Page: https://github.com/GitGuardian/ggshield
HMSL blog post: