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Re:Researcher uses 379-year-old algorithm to crack crypto ke... by shiado on Wednesday March 23, 2022 @12:46PM (#30780433)
Rapid7 has some very good datasets to play around with certificates. If you want a fun project try to find bad parameters.

https://opendata.rapid7.com/

edit: looks like public access is gone now, that's unfortunate.

Re:Researcher uses 379-year-old algorithm to crack crypto ke... by cph123 on Wednesday March 23, 2022 @12:56PM (#30780559)
"opendata.rapid7.com", not quite so open anymore then haha