Apple is making every production PCC server build publicly available for inspection so people unaffiliated with Apple can verify that PCC is doing (and not doing) what the company claims, and that everything is implemented correctly. All of the PCC server images are recorded in a cryptographic attestation log, essentially an indelible record of signed claims, and each entry includes a URL for where to download that individual build. PCC is designed so Apple can’t put a server into production without logging it. And in addition to offering transparency, the system works as a crucial enforcement mechanism to prevent bad actors from setting up rogue PCC nodes and diverting traffic. If a server build hasn’t been logged, iPhones will not send Apple Intelligence queries or data to it.
PCC is part of Apple’s bug bounty program, and vulnerabilities or misconfigurations researchers find could be eligible for cash rewards. Apple says, though, that since the iOS 18.1 beta became available in late July, no one has yet found any flaws in PCC. The company acknowledges, though, that it has only made the tools to evaluate PCC available to a select group of researchers so far.
Multiple security researchers and cryptographers tell WIRED that Private Cloud Compute looks promising, but they haven’t spent significant time digging into it yet.
“Building Apple silicon servers in the data center when we didn’t have any before, building a custom OS to run in the data center was huge,” Federighi says. He adds that “creating the trust model where your device will refuse to issue a request to a server unless the signature of all the software the server is running has been published to a transparency log was certainly one of the most unique elements of the solution—and totally critical to the trust model.”
To questions about Apple’s partnership with OpenAI and integration of ChatGPT, the company emphasizes that partnerships are not covered by PCC and operate separately. ChatGPT and other integrations are turned off by default, and users must manually enable them. Then, if Apple Intelligence determines that a request would be better fulfilled by ChatGPT or another partner platform, it notifies the user each time and asks whether to proceed. Additionally, people can use these integrations while logged into their account for a partner service like ChatGPT or can use them through Apple without logging in separately. Apple said in June that another integration with Google’s Gemini is also in the works.
Apple said this week that beyond launching in United States English, Apple Intelligence is coming to Australia, Canada, New Zealand, South Africa, and the United Kingdom in December. The company also said that additional language support—including for Chinese, French, Japanese, and Spanish—will drop next year. Whether that means that Apple Intelligence will be permitted under the European Union’s AI Act and whether Apple will be able to offer PCC in its current form in China is another question.
“Our goal is to bring ideally everything we can to provide the best capabilities to our customers everywhere we can,” Federighi says. “But we do have to comply with regulations, and there is uncertainty in certain environments we’re trying to sort out so we can bring these features to our customers as soon as possible. So, we’re trying.”
He adds that as the company expands its ability to do more Apple Intelligence computation on-device, it may be able to use this as a workaround in some markets.
Those who do get access to Apple Intelligence will have the ability to do far more than they could with past versions of iOS, from taking advantage of writing tools to photo analysis. Federighi says that his family celebrated their dog’s recent birthday with an Apple Intelligence–generated Image Playground creation shared exclusively with WIRED. But while Apple’s AI is meant to be as helpful and invisible as possible, the stakes are incredibly high for the security of the infrastructure underpinning it. So how are things going so far? Federighi sums it up without hesitation: “The rollout of Private Cloud Compute has been delightfully uneventful.”
Update September 11, 2024, at 9 pm EDT: This story was updated with clarification on the Apple Intelligence-generated image Federighi created for his dog’s birthday and additional confirmation that she is a very good dog.