Yes, I know AES/Rijndael is a symmetrical encryption algorithm that somehow became the winner of a competition NSA had a lot of strings to pull. In the same time it is considered relatively secure for most application. Our hard drives are most likely encrypted with AES128.
For super military+ grade why isn't there an AES512 or 1024 ?
It's infeasible to brute-force a 256-bit key[1]. Where cryptanalysis lowers the size of the job enough that it's feasible, the answer isn't to have a bigger key, it's to have a better algorithm.<p>[1] <a href="https://www.schneier.com/blog/archives/2009/09/the_doghouse_cr.html" rel="nofollow">https://www.schneier.com/blog/archives/2009/09/the_doghouse_...</a>