Apple mentioned back in 2011 that iMessage used encryption to safeguard conversations, but we've never had an exact understanding of how deep the security layer goes. It's deep enough to stymie interception attempts at the DEA, according to an intelligence note gleaned by CNET. The agency warns its staff that it's "impossible" to tap the messages through usual methods -- great for privacy, but a worry for law enforcers. There isn't much that officials can do, either, short of discovering a clever
