Re: Pseudorandom Hashing
From: Tim Wescott (tim_at_wescottnospamdesign.com)
Date: 09/23/04
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Date: Thu, 23 Sep 2004 15:26:18 -0700
Jim Thompson wrote:
> On Thu, 23 Sep 2004 14:40:28 -0700, Tim Wescott
> <tim@wescottnospamdesign.com> wrote:
>
>
>>I am having trouble coming up with the right keywords to do a web
>>search, so help me out here:
>>
>>There is a technique where, to significantly reduce the probability of
>>getting a long string of zeros, a message is run through a CRC
>>generator, and the output bits are taken off. The transmitted message
>>is thoroughly hashed, yet it is a simple matter of a shift register and
>>some XOR gates to decode the message on the other end.
>>
>>I thought I knew how to do this, yet in trying to actually make it work
>>I find that over half of my brain cells appear to be attending a
>>management seminar.
>
>
> "attending a management seminar".... I like that ;-)
>
>
>>So, know where I can find out how to do this right? "pseudorandom" and
>>"hash" get me tons of cryptography, but not what I'm looking for.
>>
>>Thanks.
>
>
> My mind is slow today also, but isn't it the same in AND out...
>
> XMIT: 2-bit SR, XOR the two SR Q's together to get output
>
> RECVR: SAME
>
> ...Jim Thompson
IIRC you XOR and feed back on the input, and just XOR on the output.
But IIRC then I wouldn't need to ask.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com
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