Hi, I made this Post a while back, which may be helpful. I think generally, Algorand is a quantum secure technology. There still aren’t quantum computers capable of inverting SHA-256 or running Shor’s Algorithm.
Probably the biggest security risk would be a random passphrase generator. Even still, such a generator would take a really long time to break into an account. And the account it would break into would be random. I am not sure current quantum computers would even offer a speedup here. In large part, this will depend on the performance improvement of adiabatic quantum computers or photonic circuit boards because gate model quantum computers are very slow to scale.
Thanks!