Corporations can sign and deploy proprietary internal applications directly to employee devices without publishing them publicly.
GSX Resigner is a specialized software utility used to re-sign iOS application packages (IPA files) with alternative digital certificates.
Homebrew developers using modified consoles (JTAG/RGH) frequently use GSX Resigners to test debug builds. Official retail consoles reject development executables; a resigner lowers the security check, allowing unsigned code to run on standard hardware.
Open a terminal and create a working directory:
Apple will email back a .pem certificate file. Combine it with your private key to create a .p12 file for use in your applications: