[cryptography] Let's go back to the beginning on this

Scott Guthery sbg at acw.com
Fri Sep 16 09:38:16 EDT 2011

>> In the various renditions of non-stop computing, a common
>> theme is to do the same calculation more than once and
>> compare the results, X'ing out the disagreements but keeping
>> moving forward.

This is a technique that goes back at least 200 years in the construction of 
mathematical tables; see, for example, Tables du Cadastre. Two teams using 
different computational algorithms for the same value (e.g. sine, log, etc.) 
compute the table and results are compared.  Integrated circuit cards also 
use this procedure to guard against induced error attacks.

Cheers, Scott 

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