Why Apple can be forced to turn logs of your iMessage contacts over to police
When a user sends someone a message through Apple’s iMessage feature, Apple encrypts that message between Apple devices so that only the sender and recipient can read its contents. But a report from news site the Intercept is a good reminder that not all data related to iMessage has that same level of protection -- and that information can still be turned over to law enforcement authorities. That may be surprising to everyday users who view Apple as a privacy champion after it's legal battle with the Justice Department this year over a court order that would force the company to break its own security measures. But to experts, it's just a fact of how communication systems work. For instance, as security expert and noted iPhone hacker Will Strafach notes, Apple needs to know things such as whom you're chatting with via iMessage so that it can deliver your messages.
According to a document obtained by the Intercept, Apple logs information about whom you're contacting in iMessage while the app figures out if the person you are texting is also using an iOS device. If they are using iOS, the message gets encrypted and routed through iMessage, which is signaled by blue chat bubbles. If the recipient is not using an Apple device, the message gets routed as a standard text without that extra layer of encryption, and messages appear in green bubbles in the iMessage app. According to the document, which the Intercept says originated "from within the Florida Department of Law Enforcement’s Electronic Surveillance Support Team," these logs don’t necessarily show that you messaged someone. Instead, they show when you opened up a chat window and selected the contact or entered a phone number.