Code Signing with CPK

This document discusses code signing, which involves digitally signing executables and scripts to confirm the software author and ensure the code has not been altered. Code signing can ensure code integrity, identify the source, and determine if code is trustworthy for a purpose. The architecture involves a code signing tool, kernel module to check signatures, and user-space daemon called by the kernel module. Communication between kernel and user space uses techniques like system calls, ioctl, proc filesystem, and netlink sockets.