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I am trying to find if a design of mine SHACALheader(payload) ⊕ header will have more collisions than if we just concatenate Hash(datagram) := H( H(header) || H(payload) ) ?

I am fairly new to cryptography and am still in the early stages of researching it also.

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    $\begingroup$ I've removed the separate question about the name (one question per post). You can ask it on Cryptography in a separate question if you wish. It doesn't seem to be specified in the submission to the NESSIE project though. I would not be surprised if "CAL" loosely means "Cipher ALgorithm" though. Alternatively it may mean "California" as it seems to be first proposed at the RSA conference over there. $\endgroup$
    – Maarten Bodewes
    Nov 23 at 1:03
  • $\begingroup$ @MaartenBodewes Oh that could be it. I was surprised to know this is not widely known and nobody asks about it either. BTW any definite answer or direction to if SHACalifornia-2 has collision resistance or not? $\endgroup$ Nov 23 at 3:13
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    $\begingroup$ I might not be the best person to answer that, I'd basically have to try and infer myself (which I might try if nobody else responds). Note to anybody out there, the SHACAL submission can be found here on the dormant NESSIE site; just unzip the SHACAL.zip and read the postscript file. $\endgroup$
    – Maarten Bodewes
    Nov 23 at 8:39

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