[Cryptography] Any Electrical Engineers here who know about noise filtering?

Henry Baker hbaker1 at pipeline.com
Sat Jan 2 09:50:41 EST 2016


Here's my problem:

I'm trying to characterize a 1x pad.

A 1x pad *adds* (modulo, but that shouldn't matter)
uniformly distributed "noise" (the "key") to the
"message" signal.

Classical filtering theory says that given a
noise spectrum, one can compute an optimal
filter to remove as much noise from the signal
as possible.

I'd like to go through this mathematical
exercise with modular addition and the
noise spectrum one might want for a key
distribution to show that such an
optimal filter *for this case* is the
identity -- i.e., even the optimal
filter can do *nothing* to remove any
"noise" -- i.e., the 1x pad random
signal.

I seem to recall ideas such as "Weiner
filters", and the like.



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