Hi,
Considering how Groover's algorithm would essentially cut the possibilities of any key of length N bits to N/2 bits, cutting the possibilities in half and making 256 bit reduced to a mere 128, the absolute baseline of security by current standards... Let alone future standards as computational power become cheaper and faster.
If I want to "future proof" even further, I want a symmetric streaming cipher algorithm, like chacha20, but with the key being larger than 256 bits. I prefer 512 bit or even 1024 bits.
So far from my research, no reliable / vetted / audited / NIST approved algorithm exists yet.
Any help / links / references ?