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echo: os2prog
to: Mike Bilow
from: Thomas Seeling
date: 1996-03-25 00:07:14
subject: 32-bit CRC

Hallo, Mike!


 MB>> It would surprise me if two distinct three-byte strings had identical
 MB>> CRC-32, but I see no reason that it would be mathematically
 MB>> impossible, and I can even see ways to construct such strings if they
 MB>> exist.

A CRC32 can be falsificated if you are able to change 31 bits in the data
for which the crc is calculated. There may be cases where fewer bits need
to be changed, but in general it is 31 bits.

I think you need to search some time to construct two 24 bit numbers with
the same CRC32 :-)


Tschau...Thomas

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