The first computer virus is widely thought to have been a program called Creeper that infected Apple II computers in the early 1980s. It was written by a 15-year-old high school student in 1981 as a prank. Since then, an entire class of malicious software and activities have emerged that can destroy data or eavesdrop on communication.

One way to combat eavesdropping is to use the rules of quantum physics to protect data. Indeed, there is currently huge investment in designing and testing a quantum version of the internet that will prevent eavesdropping and make communication almost perfectly secure.

But that raises an interesting question. How might malicious actors attack such a quantum internet?

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