I am learning about various digital signatures and came across DSA. In DSA, the $s$ part of the signature has a hash of the message $H(m)$. I was wondering, why can't we just use the message $m$ instead of using the hash? I understand that performance might be a part of it since the hash will ensure a certain fixed length. But any other security issues?
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There seems to be a direct dupe, please [edit] your question if anything is missing from that Q/A. – Maarten Bodewes Feb 19 '23 at 04:12