Ars Technica: Medicine show: Crown Sterling demos 256-bit RSA key-cracking at pr
ivate event.
[1]https://arstechnica.com/information-technology/2019/09/medicine-show-crown-st
erling-demos-256-bit-rsa-key-cracking-at-private-event/

   Jim Bell's comment:.

   Are they talking about a 256 bit key, or a 512 bit composite key ?

References

   1. https://arstechnica.com/information-technology/2019/09/medicine-show-crown-sterling-demos-256-bit-rsa-key-cracking-at-private-event/