development

Code Signing

The cryptographic process of applying a digital signature to an app binary to verify the developer's identity and ensure the code has not been tampered with since it was built.

provisioning profile signing certificate entitlements

Code signing is a mandatory requirement for distributing any app on Apple platforms. Every iOS, macOS, watchOS, and tvOS app must be signed with a valid certificate before it can run on a user’s device.

How Code Signing Works

The developer signs the app binary with their private key. The corresponding public key is embedded in the signing certificate, which is issued by Apple. When a device receives the app, it uses the public key to verify that the signature is valid and the code has not been modified.

If the signature check fails, iOS refuses to launch the app and macOS shows a security warning.

Certificate Types

  • Apple Development - for running apps on test devices during development
  • Apple Distribution - for App Store and TestFlight distribution
  • Developer ID Application - for macOS apps distributed outside the App Store
  • Developer ID Installer - for macOS installer packages

The Signing Chain

A complete signing setup requires three components:

  1. Signing certificate - proves your identity as a developer
  2. Provisioning profile - links the certificate to your app ID and authorized devices
  3. Entitlements - declares which system capabilities your app uses

All three must be consistent. A mismatch between any of them causes signing failures that block builds, TestFlight distribution, or App Store submission.

Code Signing and Release Velocity

Automating code signing through tools like Fastlane Match or Xcode Cloud removes manual bottlenecks from your release process. Teams that automate signing ship updates more frequently, which directly supports ASO strategies that require regular metadata updates and rapid iteration on store listing experiments.