No need to be condescending. Trust me when I say I know the bit length relates
to the collision resistance. Also trust me when I say there are other
dimensions upon which to consider one hash algo over another other then just
collision resistance such as, power consumption, execution time, whether or not
the algorithm suffers from length extension attacks.
I'm assuming the reason MD5 and SHA1 were both disallowed were because they
have been proven to have a collision resistance less then 1/2 their bit length.
But this is not the case for SHA224. It is just a truncated version of SHA256
and thus the underlying algorithm is just as strong as SHA256 except that you
can expect to find a collision in about 16 bits of work less.
So going back to my actual question SHA224 is disallowed in record files
because it's bit length is less then 256?
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