Re: Is there any strong hand cipher?

From: Daniele Raffo (login.invalid_at_domain.invalid)
Date: 11/09/04 

Date: Tue, 09 Nov 2004 14:34:02 +0100

Harri Haanpaa wrote:

>Why this obsession with alphabet size 256? Just use two regular dice and
>an alphabet size 36. With that, you can have the English alphabet and
>
>

Be careful with the choice of the "hardware" ;-) , though. Most regular
six-faced dice won't offer the true randomness required by an OTP. If
the dots on a die are carved, this alters the weight of each face, the
faces with the lowest values being the heaviest because they bear less
dots. The sum of the values on the opposite faces of a die is constant
(=7) and, by the laws of gravity, a rolled die is more likely to fall
its heaviest sides down. Therefore you are more likely to obtain high
scores. That is, the distribution of the probability is not the same for
the six values. 

-- 
Daniele Raffo
[First name].[Last name][AT]inria.fr

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