Anybody who (as I do) finds this kind of thing fascinating should go back and read Young and Yung&#x27;s work on kleptography from the late 90&#x27;s: <a href="http:&#x2F;&#x2F;www.cryptovirology.com&#x2F;cryptovfiles&#x2F;research.html" rel="nofollow">http:&#x2F;&#x2F;www.cryptovirology.com&#x2F;cryptovfiles&#x2F;research.html</a><p>They were way, way ahead of their time.