The Perl 5 module Module::Signature adds cryptographic authentications
to CPAN distributions, via the special SIGNATURE file.

If you are a module user, all you have to do is to remember running
cpansign -v (or just cpansign) before issuing perl Makefile.PL or
perl Build.PL; that will ensure the distribution has not been
tampered with.  For module authors, you'd want to add the SIGNATURE
file to your MANIFEST, then type cpansign -s before making a
distribution. You may also want to consider adding a signature
check as part of your test suite.

Homepage:
https://metacpan.org/release/Module-Signature
