How does "spy-by-crypto" work?

On Fri, Jan 22, 2016 at 2:53 PM, John Young <jya@pipeline.com> wrote:
DIRNSA said at Atlantic Council on 21 January that NSA spying ("intelligence")
and information protection (IAD) to be meshed. Separation not suitable for
current requirement.

Outside partners to aid dual tech: spy-by-crypto.