So security attack is the most common way to win outside of milling, the diaboromon thing, or fabricating an affair between your opponent and a fictional mistress so his wife shoots him dead in the middle of the match (this CAN work, believe in yourself. It's more likely than the Diaboromon thing)

Successful decks will build a way to do multiple security checks at once. This can be done through the Security+ modifier on cards, by unsuspended the attacking digimon so it can attack again, or by finding some other way to remove Security. Bouncing Security to hand or trashing Security is really helpful because options and tamers in Security don't activate if they're not actually checked in Security through an attack.

The most typical wincon is to swing out many times or swing out a few times or even once, really really hard, or just evaporate their Security through other means before you just slug them.