There are physical limits to our reality and it's very unlikely those limits can be broken (eg, speed of light). Given those limits, 2^80 is large enough that t

There are physical limits to our reality and it's very unlikely those limits can be broken (eg, speed of light). Given those limits, 2^80 is large enough that the limit cannot be surpassed without fully breaking reality (eg, timetravel). If you can break reality, all bets are off though and trying to defend against attacks that break reality in the future are impossible.