> I thought that was the main reason for using a hash of the
> password/phrase as symmetric key, to usilize the whole keyspace.

English has about two bits of entropy per glyph, so a ten-character English 
passphrase will have about twenty bits of entropy regardless of what algorithm 
you use to hash it.  You can't make an insecure passphrase suddenly 256 bits of 
entropy strong by using SHA-256.  :)


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