[$] Signing programs for Linux

At his 2017 OpenSource Summit North America talk, Matthew Garrett looked at the stateof cryptographic signing and verification of programs for Linux. Allowingpolicies that would restrict Linux from executing programs that are notsigned would provide a measure of security for those systems, but there iswork to be done to get there.Garrettstarted by talking about "binaries", but programs come in other forms(e.g. scripts) so any solution must look beyond simply binary executables.