Quoting the Washington Post:
* "Crypto’s shift to **electronic** products [..]. Foreign governments clamored for systems that seemed clearly superior to the old clunky mechanical devices but in fact were **easier** for U.S. spies to read."
* "a **circuit-based** system could be made to appear that it was producing endless streams of randomly generated characters, while in reality it would repeat itself at short enough intervals for #NSA experts [..] to **crack** the pattern."