The only reason I originally even brought one time pads up is because somebody wondered how encryption works, and it is a very simple to demonstrate algorithm and is still as secure as any algorithm can possibly be . That said, even RSA 2,048 and AES-128 are more than enough to secure your communications here. I hear that a lot of progress is being made with quantum computer based cryptanalysis and that RSA and ECC are likely doomed, but there are some quantum resistant multivariate quadratic polynomial based algorithms that look promising for the future. Honestly I don't understand the details of such advanced mathematics though.