[dehrmann]

> quantum computers that will make cracking his vault trivial

Disk encryption tends to use something like AES. Key derivation is usually built on top of hash functions, but a 64-character password has more bits than most people use for AES, so key derivation might not matter.

The implications for AES aren't known yet, beyond effectively reducing the key length[1]. You're probably thinking about prime factoring and RSA, which will be weakened by quantum computing.

[1]: https://security.stackexchange.com/questions/116596/will-qua...