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"I think crypto will slowly percolate its way up and people will adopt it gradually as user friendly, cheap products, become available."
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Here's a handy invention that would have been impossible in the 1940's (when the story was written) but is eminently manufacturable in the 21st century. Not satisfied with technologies that were merely forty years ahead of his time, Heinlein skipped right over the entire cell phone era.
Hopefully, it uses a very low level of radiation in transmitting back to the caller.
As far as the originality of the idea is concerned, I can't find a reference to something like this earlier than 1940 - can you?
In 2000, Digital Angel created a subdermal device that "can be used to monitor a person's key body functions -- such as temperature and pulse -- and transmit that data wirelessly, on a real time basis, along with the accurate location of the person, to a web-enabled ground station or monitoring facility," according to their press release. Comment/Join this discussion ( 7 ) | RSS/XML | Blog This | Additional
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