What is a CERTSIGNINGREQUEST file? Certificate request file created by Keychain Access, an Apple tool that manages and stores passwords and certificates; contains data referenced by Apple to request a signing certificate for iOS and Mac development.

More Information You will need to upload your CERTSIGNINGREQUEST file to "https://developer.apple.com" (you'll need an Apple ID to login). This is necessary in order to request a Development and Distribution Certificate that enables you to generate .IPA files, which are needed for final distribution and uploading of your app(s) to Apple. To create the CERTSIGNINGREQUEST file: Select Keychain Access → Certificate Assistant → Request a Certificate From a Certificate Authority... . Enter the appropriate information in the fields, click Continue . Name your file (or leave it as the default "CertificateSigningRequest" name), choose the save location, and click Save then Done .