How to re-sign an iOS Application

Resign iOS App

Here's what you do!

1. Terminal: Unzip the ipa (it's just a zip file after all)
  unzip -q App.ipa
  
1a, You will need to have the entitlements file, this information is needed during signing.
  codesign -d --entitlements :- "Payload/App.app"
  
2. Terminal: This will produce a `Payload/` directory. Remove the existing code signature.
  rm -rf Payload/App.app/_CodeSignature
  
3. Terminal: You'll need a valid provisioning profile. Copy this into the payload.
  cp <file>.mobileprovision Payload/App.app/embedded.mobileprovision
  
  Note: If you've had a provisioning profile setup by Xcode 5, they're at the location
  ~/Library/MobileDevice/Provisioning\ Profiles/
  
4. Terminal: Now resign the application with your developer certificate.
   The certificate name needs to match what's listed within Keychain Access.
  /usr/bin/codesign -f -s "<Certificate Name>" --resource-rules Payload/App.app/ResourceRules.plist --entitlements Payload/App.app/Entitlements.plist Payload/App.app
  
6. Terminal: Rezip the newly signed app
  zip -qr App.ipa Payload
  
7. Xcode: Get your device in the Organizer, and drag the .ipa to the Applications section