3.Elliptic chubu: elliptic chubu ndi chinthu chatsopano chomwe chinayambitsidwa m'zaka zaposachedwa.Poyerekeza ndi chubu chozungulira, chubu cha elliptic chili ndi mphamvu yokana kukakamiza.Komabe, chifukwa chubu cha elliptic chomwe chilipo chimapangidwa ndi tepi yopangira malata, ntchito yake yolimbana ndi dzimbiri ndi yocheperapo poyerekeza ndi chubu chozungulira.
4.Profile Zitsulo: amagwiritsidwa ntchito pamwamba pa wowonjezera kutentha wanzeru kupanga chitsulo chimango.Zili ndi ubwino wa mtengo wotsika komanso wosasunthika wosasunthika poyerekeza ndi chitoliro cha square.Imagwiritsidwa ntchito makamaka m'madera omwe ali ndi nkhawa yochepa komanso chitetezo cha dzimbiri.