Millions and millions of people use iMessage every day. But how many people know exactly what’s going on behind the scenes, or what happens to a message once you send it?
Maybe a handful. Up until now, the vast majority of what we knew about iMessage’s inner workings came from reverse engineering and best guesses. This week, however, Apple quietly released a document that breaks it all down.
If you know your stuff when it comes to cryptography, you can find the document here. The iMessage bit starts at page 20, but there’s all sorts of crazy interesting stuff regarding cloud keychain and hardware security packed in there too.
If you don’t know much about crypto, I’ll try to break it down a bit below. I admittedly have plenty of gaps in my crypto knowledge, but I’ve triple-checked this with people who know considerably more about this topic than I.
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