phc-discussions - RE: [PHC] Initial (non-proof-read) NeolKDF paper

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Message-ID: <003c01cf1a1b$9f855bb0$de901310$@cfl.rr.com>
Date: Sat, 25 Jan 2014 17:20:15 -0500
From: "Gary W. Hvizdak" <gary.hvizdak@....rr.com>
To: <discussions@...sword-hashing.net>
Subject: RE: [PHC] Initial (non-proof-read) NeolKDF paper

Resending reformatted for readability ...

-----Original Message-----
From: Gary W. Hvizdak [mailto:gary.hvizdak@....rr.com] 
Sent: Saturday 25 Jan 2014 1718
To: discussions@...sword-hashing.net
Subject: RE: [PHC] Initial (non-proof-read) NeolKDF paper

Bill Cox wrote ...

If you would like to see the earliest version and maybe provide some
constructive feedback, please feel free to take a look.  It's at:

https://github.com/waywardgeek/noelkdf/blob/master/NoelKDF.odt

--

Bill,

    In 2.1 Simplified NoelKDF, the statement ...

    value = value*(mem[prevAddr++] | 3) + mem[randAddr++];

... is equivalent to ...

  switch ( mem[prevAddr++] | 3 )
  {
    case 0 : value = mem[randAddr++];
break;
    case 1 : value = mem[randAddr++] + value;
break;
    case 2 : value = mem[randAddr++] +               (value << 1);  break;
    case 3 : value = mem[randAddr++] + value + (value << 1);  break;
    default :
  }

... which is surely the route an attacker would take.

Cheers,
Gary