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In the Apple Developer Portal, in Certificates, Developer (or Distribution) it says:
"If you do not have the WWDR intermediate certificate installed, click here to download now."
I don't even know what that means. Do I need to download and run that? or do I need to only download the current certificate only?
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Apple Developer ID Intermediate Certificate (G2)The digital certificates you use to sign your software and installer packages on macOS are now issued from a new Developer ID Intermediate Certificate that expires on September 16, 2031.
The WWDR certificate links your development certificate to Apple, completing the trust chain for your application.
An intermediate certificate works as a substitute of a root certificate because root certificate has its own security layers assuring that its keys remain unobtainable. Intermediate certificate plays a “Chain of Trust” between an end entity certificate and a root certificate.
The Apple Worldwide Developer Relations Certificate Authority issues certificates used by developers for signing third-party apps and Safari Extensions, and for using Apple Wallet and Apple Push Notification services.
You need to download it and double click on it. It will get stored in your computer's KeyChain. It can be described best as something like root level certificate authority that affirms that your development or distribution profile certificate was issued by Apple's WWDR and not forged somewhere else.
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iPhone Game Development book says:
WWDR certificate
Apple’s World Wide Developer Relations (WWDR) certificate is available from Apple at http://developer.apple.com/certificationauthority/AppleWWDRCA.cer. Download and install the certificate so that you can use it to certify builds. The WWDR certificate links your development certificate to Apple, completing the trust chain for your application.
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