Brute Force attack Question (basic)
Joel Morgan
morgan at keilin.helsinki.fi
Wed Jul 24 18:33:20 PDT 1996
Perry E. Metzger writes:
>
> Igor Chudov writes:
> > What is Alice and Bob decide to obscure their letters and add random
> > NON-ASCII characters at random places?
>
> Assuming I'm using a statistics based technique, that won't help.
>
Some fairly basic questions:
1) Is a statistical test like this done on the net composition of the
whole message or locally, point by point throughout the text (for
example, using a window)?
2) If what's tested is the net composition of the message, could you
choose padding to normalize a message back to an apparently random
distribution?
3) What kind of computation overhead does this statistical testing
impose (compared to what would be needed for a known-plaintext
search)?
Thanks,
Joel/
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