2013.06.12 23:52:25 (344935245176528898) from Daniel J. Bernstein, replying to "ᴇʀɪᴄʜ ᴏᴄᴇᴀɴ (@erichocean)" (344918046726553600):
@erichocean No. 1MB key provides ~2^256 security (and more than 2^128 post-quantum); 64KB key provides ~2^80 (more than 2^40 post-quantum).