Relative Message Digest

From: RR (russrob_at_hotpop.com)
Date: 09/03/03 

Date: Wed, 03 Sep 2003 00:30:57 GMT

I'm looking for an algorithm that produces message digests that can be
compared to give an approximation of the amount of difference between two
messages.

    h_1 = Digest(m_1)
    h_2 = Digest(m_2)

where the difference between h_1 and h_2 is proportional to the difference
between m_1 and m_2.

Do such beasts exist?

thanks,
RR

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