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Re: key-ed MD5 again

> Some significant analysts think that a single key at the beginning of
> MD5 does not provide enough key material when the text is long.  The
> MD5(key,MD5(text)) was suggested to improve the effect of the key in the
> final hash.

Are there any reference of the analysis?

As MD5 is a chain of addition, a transitive 1-to-1 mapping, of
hashed values, it is unlikely that the initial scrambling effect
by the added hased key is weakened later.

							Masataka Ohta