Computer and Network Security doesn't really appear explicitly in Everything Everywhere All at Once. While the universe is represented as a network of nodes the directors didn't really go into depth about it and in the film the connections between points is not secured and anyone can traverse to their counterpart in another universe. As for computers there was also limited mentions and uses of computers in the entirety of the film with the closest being the verse traversal scenes where they compute the nessasary actions to take to connect with an alternate you.