Crypto Currencies? DIgital Cash. What is it? And How secure?

@amal06 (250)
June 7, 2018 4:18am CST
People have been going GaGa over bitcoin over past few years and suddenly a big swarm of crypto currencies has taken over the internet. However some countries have called them illegal but you can still trade in them. How secure is this? And how does it work? Any ideas??
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