Truffle Hog searches through git repositories for high entropy strings, digging deep into commit history and branches. This is effective at finding secrets accidentally committed that contain high entropy.
You can download it from the following link: https://packetstormsecurity.com/files/download/140389/truffleHog-master.zip
Source: https://packetstormsecurity.com/files/140389/Truffle-Hog.html