What is Code Signing?#

Using certificates issued by trusted Certificate Authorities, code signing attaches cryptographic signatures to software. Operating systems verify the signature to alert users if files have been modified.

Everyday Analogy#

A wax seal placed on an official parchment document, proving it originated from the royal court and was never opened in transit.

Practical Applications#

  • Signing Windows and macOS software installers to bypass security warnings
  • Verifying the authenticity of WordPress updates and theme packages