The Silver Searcher is a tool for searching code. It started off as a clone of Ack, but their feature sets have since diverged slightly. In typical usage, Ag is 5-10x faster than Ack. See the GitHub page for more info.
Release tarballs are signed with my public key (3F0A04B6). To verify a release, first download my public key and import it:
gpg --import ggreer_gpg_key.asc
After downloading the tarball and signature, run:
gpg --verify the_silver_searcher-1.0.2.tar.gz.asc \ the_silver_searcher-1.0.2.tar.gz