The interesting phenomenon related to the RSA algorithm and is not shared with some of the other algorithms is it is useful for both encryption and for digital signature. That is they are two distinct uses and this single algorithm is useful for both of those. And there’s an amazing and somewhat interesting story that then develops from that.
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The people that invented Ethernet did a real good thing. Ethernet is good technology. But they did a really bad thing because they called it a net. And they shouldn’t have called it Ethernet, they should’ve called it “Etherlink.”