Tags: modular-arithmetic linear_algebra crypto 

Rating: 1.0

It is not super-detailed,

(although it still turned out to be pretty long)

but I hope it explains the main ideas:

https://paper.dropbox.com/doc/DefCon-CTF-2020-ooo-flag-sharing--A0I~j7vZ3aoLA6d9rZOfGi4uAQ-a69qqRwBINkdCEVfNUN1S