Yes, security margins are all about what can and cannot be brute forced! You can't compare these 2 scenarios directly, because in practice: - attackers can ta

Yes, security margins are all about what can and cannot be brute forced! You can't compare these 2 scenarios directly, because in practice: - attackers can take as many guesses as they want against a piece of data protected by a 128-bit key, but - attackers get only 1 chance that a particular piece of data protected by a supposed prime is not a prime.