Score:2

If rabin signature uses a hash function then why cant we use that hash function to sign a message?

mr flag

About Rabin Signature link

According to this paper, the person who wants to sign a message M first appends a random byte string U.
=> M_new = MU Then uses a compression function to get c = Compression_function(MU)
Then solves the equation for x, x(x+b) mod n = c mod n.

Then the signature is (U,x) pair.

My question is why cant we just use c as a signature?

I Assume that 'compression_function' is a collision resistant hash function.

fgrieu avatar
ng flag
Hint: how would you verify that signature, and distinguish one made by the authorized signer from one made by anyone else?
void_117 avatar
mr flag
@fgrieu oh thanks. I understand it now.
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