Apple's iMessage has DEA Tongue Tied

Encryption used in Apple's iMessage chat service has stymied attempts by federal drug enforcement agents to eavesdrop on suspects' conversations, an internal government document reveals.

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An internal Drug Enforcement Administration document seen by CNET discusses a February 2013 criminal investigation and warns that because of the use of encryption, "it is impossible to intercept iMessages between two Apple devices" even with a court order approved by a federal judge...

When Apple's iMessage was announced in mid-2011, Cupertino said it would use "secure end-to-end encryption." It quickly became the most popular encrypted chat program in history: Apple CEO Tim Cook said last fall that 300 billion messages have been sent so far, which are transmitted through the Internet rather than as more costly SMS messages carried by wireless providers. (more)

But... if messages are exchanged between an Apple device and a non-Apple device, they "can sometimes be intercepted, depending on where the intercept is placed." (more)