Date   : Fri, 27 Jan 2012 08:18:10 +0000 (GMT)
From   : info@... (Sprow)
Subject: CRC-8 algorithm

In article <e94c3827cec73b2523b3fdceeccedefc@...>,
   J.G.Harston <jgh@...> wrote:
> Sprow wrote:
> > Would the one in the BBC micro tape filing system be suitable?
>
> That's CRC-16, which I use when I need a 16-bit CRC.

True! You're free to use only one byte of the result, or modify the
polynomial to not collect terms from about bit 8. 

I wasn't really clear why protecting 20 bytes with a 2 byte CRC was
overkill, you still have 2^160 combinations being protected by a CRC which
will alias 2^10 of the combinations,
Sprow.