I have a 256 bit string (indistinguishable from random) which I wish to encode into a greater length string using an error correction code.
The result must also be indistinguishable from random. It should not be possible to detect the presence of error correction from the result.
Is it possible? And if so, how?
PS: Related: https://crypto.stackexchange.com/questions/80890/error-correcting-codes-that-are-indistinguishable-from-random