http://www.scmagazine.com.au/News/292189,nsa-builds-android-phone-for-top-secret-calls.aspx
makes for interesting reading. I was particularly intrigued by this:
Voice calls are encrypted twice in accordance with NSA policy,
using IPSEC and SRTP, meaning a failure requires “two independent
bad things to happen,” Salter said.
Margaret Salter is the head of the Information Assurance Directorate
of the NSA.
--Steve Bellovin, https://www.cs.columbia.edu/~smb
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