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.
I’ve been involved with the Internet Society for virtually its entire life. Years ago, I had the good fortune to be involved with the early days of the ARPANET and played a small role in helping build some of the technology, and in building some of the social structures that brought everybody together.
We had to choose a name for the operating system for our network. We checked various things— We had a Sigma 7, we went Sigma 7 Executive, 7 Executive, just SEX. First post on the ARPANET, we put sex on the Internet. It’s documented.