Re: Computing Rijndael's S-Box?
Date: 28 Aug 2005 17:25:19 -0700
You should read about finite fields.
One way to compute an inverse in this field is raise the element to the
254th power -- but that assumes you know how to multiply in the field.
There are faster ways of computing the inverse, but they would take
time to explain, and I am impatient.