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Re: 64-bit digest algorithms

by kvale (Monsignor)
on Nov 13, 2008 at 01:59 UTC ( #723323=note: print w/replies, xml ) Need Help??


in reply to 64-bit digest algorithms

It is somewhat obscure, but there is a message (or data) authenication code defined in FIPS 113 - Computer Data Authentication based on DES that produces a 64-bit digest.

-Mark

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Re^2: 64-bit digest algorithms
by BrowserUk (Pope) on Nov 13, 2008 at 06:57 UTC

    I'm probably being too literal here, but I don't get where the 'G' appears in the "following equations"?

    The calculation of the DAC is given by the following equations where G represents the Exclusive-OR of two vectors. 

     01  = e(D1)
 02  = e(D2 + 01)
 03  = e(D3 + 02)
 On  = e(Dn + 0n-1)

    [download]

    The algorithm also seems to call for DES encryption and a secret key. I think the the duality of the term 'digest' is screwing me here. "64-bit hashing algorithm" seems to turn up better hits.

    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
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